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Marine Biological Laboratory/University of Chicago

STANDARDS FOR SCIENTIFIC DIVING MANUAL

Updated December 2018 AAUS
Updated 21 March 2019 �黨�ǿ���Ƶ

Based on The American Academy of Underwater Sciences Guidelines

FOREWORD

Since 1951 the scientific diving community has endeavored to promote safe, effective diving through self-imposed diver training and education programs.  Over the years, manuals for diving safety have been circulated between organizations, revised and modified for local implementation, and have resulted in an enviable safety record.

This document represents the minimal safety standards for scientific diving at the present day.  As diving science progresses so must this standard, and it is the responsibility of every member of the Academy to see that it always reflects state of the art, safe diving practice.

American Academy of Underwater Sciences

Acknowledgements

The Academy thanks the numerous dedicated individual and organizational members for their contributions and editorial comments in the production of these standards.

Revision History

Available at 

This Diving Safety Manual has been and reviewed, rewritten and accepted by the DCB to meet the current needs of the Marine Biological Laboratory located in Woods Hole MA.  It is the purpose of the Marine Biological Laboratory, as an organizational member of the American Academy of Underwater Sciences, to ensure that �黨�ǿ���Ƶ adheres to and is compliant with the most current version of the AAUS Standards for Scientific Diving.

�黨�ǿ���Ƶ( �黨�ǿ���Ƶ), a private nonprofit institution established in 1888, as an international center for research, education, and training in biology.  The �黨�ǿ���Ƶ hosts major year round research programs including those in cell and developmental biology, molecular evolution, neurobiology and sensory physiology, and ecosystems studies.  Each summer, more than 800 scientists and advanced students from around the world join �黨�ǿ���Ƶ’s year round community to study a diverse variety of aquatic life.   Many of these studies require diving activities as part of the research, being conducted.  In order to safely conduct these activities �黨�ǿ���Ƶ complies with standards established by the American Academy of Underwater Sciences (AAUS).

Marine Biological Laboratory Scientific Diving Manual

This manual contains all policies and standards concerning our research diving program.

This page contains the indices to the different sections of the manual. Each Section is kept on a different web page to speed up loading and browsing. You can return to this index from any page by clicking on “Dive Manual TOC” in the menu to the left.

1.00 General Policies

1.10 The Scientific Diving Standards
1.20 Operational Control
1.30 Consequence of Violation of Regulations by Scientific Divers
1.40 Consequences of Violation of Regulations by Organizational Members
1.50 Record Maintenance

2.00 Diving Regulations

2.10 Introduction
2.20 Pre-dive Procedures
2.30 Diving Procedures
2.40 Post-dive Procedures
2.50 Emergency Procedures
2.60 Flying after Diving
2.70 Record Keeping Requirements

3.00 Diving Equipment

3.10 General Policy
3.20 Equipment
3.30 Auxiliary Equipment
3.40 Support Equipment
3.50 Equipment Maintenance
3.60 Air Quality Standards

4.00 Scientific Diver Certification And Authorizations

4.10 Prerequisites
4.20 Training
4.30 Diver Certification and Authorizations
4.40 Depth Authorizations
4.50 Maintaining Active Status
4.60 Revocation of Authorization

5.00 Medical Standards

5.10 Medical Requirements
5.20 Frequency of Medical Evaluations
5.30 Information Provided Examining Physician
5.40 Content of Medical Evaluations
5.50 Physician’s Written Report

6.00 Nitrox Diving

6.10 Requirements for Nitrox Authorization
6.20 Minimum Activity to Maintain Authorization
6.30 Operational Requirements
6.40 Nitrox Diving Equipment

Appendices 1-9 (Download Word doc)

Appendix 1 – Diving Medical Exam Overview For The Examining Physician
Appendix 2 – AAUS Medical Evaluation Of Fitness For Scuba Diving Report
Appendix 2b – AAUS/ �黨�ǿ���Ƶ Medical Evaluation Of Fitness For Scuba Diving Report
Appendix 3 – Diving Medical History Form
Appendix 4 – Recommended Physicians With Expertise In Diving Medicine
Appendix 5 – Definition Of Terms
Appendix 6 – �黨�ǿ���Ƶ/AAUS Request For Diving Reciprocity Form
Verification Of Diver Training And Experience
Appendix 7 – Emergency Action Plan
Appendix 8 – �黨�ǿ���Ƶ/AAUS Statistics Collection Criteria And Definitions
Appendix 9 – Recommendations For Rescue Of A Submerged Unresponsive Compressed-Gas Diver

Appendix 10 – Dive Plan (Download Word doc)

1.10 The Scientific Diving Standards

Purpose
The purpose of these Scientific Diving Standards is to ensure scientific diving is conducted in a manner that will maximize the protection of scientific divers from accidental injury and/or illness, and to set forth standards for training and certification that will allow a working reciprocity between Organizational Members (OMs or OM).  Fulfillment of these purposes shall be consistent with the furtherance of research and safety, and facilitation of collaborative opportunities between AAUS OMs.

This Manual sets minimum standards for the establishment of American Academy of Underwater Sciences (AAUS) recognized scientific diving programs, the organization for the conduct of these programs, and the basic regulations and procedures for safety in scientific diving operations.  It also establishes a framework for reciprocity between AAUS OMs that adhere to these minimum standards.

Historical Perspective
This Manual was developed and written by AAUS by compiling the policies set forth in the diving manuals of several university, private, and governmental scientific diving programs.  These programs share a common heritage with the scientific diving program at the Scripps Institution of Oceanography (SIO).  Adherence to the SIO standards has proven both feasible and effective in protecting the health and safety of scientific divers since 1954.

In 1982, OSHA exempted scientific diving from commercial diving regulations
(29CFR1910, Subpart T) under certain conditions that are outlined below.  The final guidelines for the exemption became effective in 1985 (Federal Register, Vol. 50, No.6, p.1046).  AAUS is recognized by OSHA as the scientific diving standard setting organization.

Scientific Diving Definition
Scientific diving is defined (29CFR1910.402) as:

“Diving performed solely as a necessary part of a scientific, research, or educational activity by employees whose sole purpose for diving is to perform scientific research tasks. Scientific diving does not include performing any tasks usually associated with commercial diving such as: Placing or removing heavy objects underwater; inspection of pipelines and similar objects; construction; demolition; cutting or welding; or the use of explosives.”

Scientific Diving Exemption
The two elements that a diving program must contain as defined by OSHA in 29 CFR 1910 Subpart T 1910.401(a)(2)(iv) are:

• a) Diving safety manual which includes at a minimum: Procedures covering all diving operations specific to the program; procedures for emergency care, including recompression and evacuation; and criteria for diver training and certification.
• b) Diving control (safety) board, with the majority of its members being active divers, which must at a minimum have the authority to: Approve and monitor diving projects; review and revise the diving safety manual; assure compliance with the manual; certify the depths to which a diver has been trained; take disciplinary action for unsafe practices; and, assure adherence to the buddy system (a diver is accompanied by and is in continuous contact with another diver in the water) for SCUBA diving.

OSHA has granted an exemption for scientific diving from commercial diving regulations under the following guidelines (Appendix B to 29 CFR 1910 Subpart T):

• The Diving Control Board consists of a majority of active scientific divers and has autonomous and absolute authority over the scientific diving program’s operation.
• The purpose of the project using scientific diving is the advancement of science; therefore, information and data resulting from the project are non-proprietary.
• The tasks of a scientific diver are those of an observer and data gatherer. Construction and trouble-shooting tasks traditionally associated with commercial diving are not included within scientific diving.
• Scientific divers, based on the nature of their activities, must use scientific expertise in studying the underwater environment and therefore, are scientists or scientists-in-training.

Recommendations for Changes to AAUS Manual
As part of the �黨�ǿ���Ƶ’s annual report, recommendations for modifications of this Manual must be submitted to AAUS for consideration.

1.20 Operational Control

Organizational Member Auspices and Responsibilities

�黨�ǿ���Ƶ auspices include any scientific diving operation in which an �黨�ǿ���Ƶ is connected because of ownership of life support equipment used, locations selected, or relationship with the individual(s) concerned. This includes all cases involving the operations of authorized individuals of the �黨�ǿ���Ƶ or auxiliary organizations, where such individuals are acting within the scope of their authorization.

It is the �黨�ǿ���Ƶ’s responsibility to adhere to the AAUS Standards for Scientific Diving Certification and Operation of Scientific Diving Programs. The administration of the local diving program will reside with the �黨�ǿ���Ƶ’s Diving Control Board (DCB).

The regulations herein must be observed at all locations where scientific diving is conducted.

Organizational Member Diving Safety Manual

Meeting AAUS minimum standards is a requirement for organizational membership in the Academy. The �黨�ǿ���Ƶ has developed and maintains a diving safety manual that includes wording on how the OM defines specific policies and procedures required for the proper function of a scientific diving program. The �黨�ǿ���Ƶ manual must address environmental and working conditions unique to the program’s operations. The �黨�ǿ���Ƶ diving manual must meet or exceed the AAUS standards.

AAUS standards must be the foundation for the development of the �黨�ǿ���Ƶ’s scientific diving safety manual. The order and formatting of the �黨�ǿ���Ƶ’s manual does not have to conform to the AAUS template. The information contained in Volume 1, Sections 1.00 through 5.00 and the Appendices are required for all manuals.  Volume 2, Sections 6.00 through 12.00 are required only when the �黨�ǿ���Ƶ conducts the specifically referenced diving mode or activity.  Deviations or significant changes to AAUS minimum standards may require justification before approval is granted by the AAUS Standards Committee.

Diving Control Board

• The Diving Control Board (DCB) must consist and maintain a majority of active scientific divers. Voting members include the Diving Safety Officer (DSO), and other representatives of the diving program such as qualified divers and members selected by procedures established by    A chairperson and a secretary may be chosen from the membership of the board according to local procedure.
• Has autonomous and absolute authority over the scientific diving program’s operation.
• The DCB must:
  • Establish additional standards, protocols, and operational procedures beyond the AAUS minimums to address �黨�ǿ���Ƶ’s specific needs and concerns.
  • Approve and monitor diving projects.
  • Review and revise the diving safety manual.
  • Ensure compliance with the diving safety manual.
  • Approve the depth to which a diver has been authorized to dive.
  • Take disciplinary action for unsafe practices.
  • Ensure adherence to the buddy system for scientific diving.
  • Act as the official representative of the �黨�ǿ���Ƶ in matters concerning the scientific diving program.
  • Act as a board of appeal to consider diver-related problems.
  • Recommend the issue, reissue, or the revocation of diving authorizations.
  • Recommend changes in policy and amendments to AAUS and the �黨�ǿ���Ƶ’s diving safety manual as the need arises.
  • Establish and/or approve training protocols or standards through which the applicants for authorization can satisfy the requirements of the �黨�ǿ���Ƶ’s diving safety manual.
  • Suspend diving operations considered to be unsafe or unwise.
  • Establish criteria for equipment selection and use.
  • Recommend new equipment or techniques.
  • Establish and/or approve facilities for the inspection and maintenance of diving and associated equipment.
  • Ensure that the �黨�ǿ���Ƶ’s air station(s) meet air quality standards as described in Section 3.60.
  • Periodically review the DSO’s performance and program.
  • Investigate diving incidents within the �黨�ǿ���Ƶ’s diving program or violations of the �黨�ǿ���Ƶ’s diving safety manual.
• The DCB may delegate operational oversight for portions of the program to the DSO; however, the DCB may not abdicate responsibility for the safe conduct of the diving program.

Diving Safety Officer

The Diving Safety Officer (DSO) serves as a voting member of the DCB, and should be designated one of the �黨�ǿ���Ƶ’s Representatives to AAUS.  This person should have broad technical expertise and experience in research related diving.

Qualifications:

1. Must be an active scuba instructor from an internationally recognized certifying agency.
2. Must be appointed by the responsible administrative officer or designee, with the advice and counsel of the DCB.
3. Must qualify as a Full Voting Member of AAUS as defined by AAUS Bylaws:
   • “(a) Holds a diving certification from a recognized national certifying agency or equivalent, and
   • (b) Has engaged in sustained or successive scientific diving activities during the past two years, or
   • (c) Has completed a course in scientific diving that meets the requirements as specified by the most current edition of the AAUS Standards for Scientific Diving.”

4. Must attend an AAUS DSO Orientation within one year of accepting a position at an AAUS approved OM, unless he/she has served as a DSO for another current AAUS OM within the last year.

Duties and Responsibilities

1. Answers, through the DCB, to the appropriate administrative officer or designee, for the conduct of the scientific diving program of the �黨�ǿ���Ƶ.
2. If delegated by the DCB, the routine operational authority for this program rests with the DSO. This oversight includes, but is not limited to: training, diver authorizations, approval of dive plans, maintenance of diving records, and ensuring compliance with this Manual.
3. May permit some duties and responsibilities to be carried out by a qualified delegate, with the approval of the DCB.
4. Must be guided in the performance of the required duties by the advice of the DCB, but operational responsibility for the conduct of the scientific diving program will be retained by the DSO.
5. Must suspend diving operations determined to be unsafe or unwise.

Instructional Personnel Qualifications

All personnel involved in diving instruction under the auspices of the �黨�ǿ���Ƶ must be reviewed and authorized by the DCB.

Lead Diver

For each dive, one individual shall be designated as the Lead Diver who shall be at the dive location during the diving operation.  The Lead Diver shall be responsible for:

• Ensuring dives are conducted in accordance with Section 2.0.
• Ensuring all dive team members possess current authorization and are qualified for the type of diving operation.
• Coordination with other known activities in the vicinity that are likely to interfere with diving operations.
• Ensuring safety and emergency equipment is in working order and at the dive site.
• Suspending diving operations if in their opinion conditions are not safe.
• Reporting to the DCB, through the DSO, any physical problems or adverse physiological effects including symptoms of pressure-related injuries.

Reciprocity and Visiting Scientific Diver

• Two or more AAUS OMs engaged jointly in diving activities, or engaged jointly in the use of diving resources, must designate one of the participating DCBs to govern the joint dive project. However, responsibility for individual divers ultimately resides with the home OM.
• A Scientific Diver from one OM must apply for permission to dive under the auspices of another OM by submitting to the DSO of the host OM a document containing all the information listed in Appendix 6, signed by the DSO or designee of the home DCB.
• A visiting Scientific Diver may be asked to demonstrate their knowledge and skills for the planned dive.
• If a host OM denies a visiting Scientific Diver permission to dive, the host DCB must notify the visiting Scientific Diver and their DCB with an explanation of all reasons for the denial.

Waiver of Requirements

The �黨�ǿ���Ƶ DCB may grant a waiver for specific requirements of training, examinations, depth authorizations, and minimum activity to maintain authorizations. AAUS medical standards may not be waived.

1.30 Consequence of Violation of Regulations by Scientific Divers

Failure to comply with the regulations of the �黨�ǿ���Ƶ’s diving safety manual may be cause for the restriction or revocation of the diver’s scientific diving authorization by action of the �黨�ǿ���Ƶ’s DCB.

1.40 Consequences of Violation of Regulations by Organizational Members

Failure to comply with the regulations of this Manual may be cause for the restriction or revocation of the �黨�ǿ���Ƶ’s recognition by AAUS.

1.50 Record Maintenance

The �黨�ǿ���Ƶ must maintain consistent records for its diving program and for each participant. These records include but are not limited to: diving safety manual; equipment inspection, testing, and maintenance records; dive plans (project and/or individual); records of dive (project and/or individual); medical approval to dive; diver training records; diver authorization(s); individual dive log; dive incident reports; reports of disciplinary actions by the DCB; and other pertinent information deemed necessary by the �黨�ǿ���Ƶ.

Availability of Records:

• Medical records must be available to an attending physician of a diver or former diver when released in writing by the diver.
• Records and documents required by this Manual must be retained by the �黨�ǿ���Ƶ for the following period:

1. Diving safety manual – Current document only.
2. Equipment inspection, testing, and maintenance records – Minimum current entry or tag.
3. Records of Dive – minimum of 1 year, except 5 years where there has been an incident of pressure-related injury.
4. Medical approval to dive – Minimum of 1 year past the expiration of the current document except 5 years where there has been an incident of pressure-related injury.
5. Diver training records – Minimum of 1 year beyond the life of the diver’s program participation.
6. Diver authorization(s) – Minimum of 1 year beyond the life of the diver’s program participation.
7. Pressure-related injury assessment – 5 years.
8. Reports of disciplinary actions by the DCB – Minimum of 1 year beyond the life of the diver’s program participation.

2.10 Introduction

No person shall engage in scientific diving operations under the auspices of the �黨�ǿ���Ƶ’s scientific diving program unless they are authorized pursuant to the provisions of this Manual.

2.20 Pre-Dive Procedures

Dive Plans

Before conducting any diving operations under the auspices of the �黨�ǿ���Ƶ, a dive plan for the proposed project or dive must be formulated and submitted for approval by the DCB or designee.  Dives should be planned around the competency of the least experienced diver.  The dive plan (project or individual) should include the following:

• Diving Mode(s) and Gas(es)
• Divers’ authorizations
• Approximate number of proposed dives
• Location(s) of proposed dives
• Estimated depth(s) and bottom time(s) anticipated
• Decompression status and repetitive dive plans, if required
• Proposed work, equipment, and boats to be employed
• Any hazardous conditions anticipated
• Emergency Action Plan (Appendix 7)
• In water details of the dive plan should include:
• Dive Buddy assignments and tasks
• Goals and objectives
• Maximum depth(s) and bottom time
• Gas management plan
• Entry, exit, descent and ascent procedures
• Perceived environmental and operational hazards and mitigations
• Emergency and diver recall procedures

Diver Responsibility and Refusal to Dive

The decision to dive is that of the diver.  The ultimate responsibility for safety rests with the individual diver.  It is the diver’s responsibility and duty to refuse to dive, without fear of penalty, if in his/her judgment, conditions are unsafe or unfavorable, or if he/she would be violating the precepts of regulations in this Manual.

No dive team member will be required to be exposed to hyperbaric conditions against his/her will.

No dive team member may dive for the duration of any known condition, which is likely to adversely affect the safety and health of the diver or other dive team members.

Pre-dive Safety Checks

• Prior to commencing the dive, the team must assure that every team member is healthy, fit, and trained for the type of dive that is being attempted.
• Scientific divers must conduct a functional check of their diving equipment in the presence of the dive buddy or tender. They must ensure the equipment is functioning properly and suitable for the type of diving operation being conducted.
• Each diver must have the capability of achieving and maintaining positive buoyancy at the surface.
• Environmental conditions at the site will be evaluated prior to entering the water.

Pre-dive Briefings

Before conducting any diving operations under the auspices of the �黨�ǿ���Ƶ, the dive team members must be briefed on:

• Dive Buddy assignments and tasks
• Dive objectives.
• Maximum depth(s) and bottom time
• Turn around pressure and required surfacing pressure
• Entry, exit, descent and ascent procedures
• Perceived environmental and operational hazards and mitigations
• Emergency and diver recall procedures

2.30 Diving Procedures

Solo Diving Prohibition

All diving activities must assure adherence to the buddy system.  This buddy system is based upon mutual assistance, especially in the case of an emergency.

Decompression Management

• On any given dive, both divers in the buddy pair must follow the most conservative dive profile
• A safety stop performed during the ascent phase of the dive should be conducted on any dive that exceeds 30 feet (9.14m).

Termination of the Dive

Any dive must be terminated while there is still sufficient cylinder pressure to permit the diver to safely reach the surface, including decompression time, or to safely reach an additional air source at the decompression station.

It is the responsibility of the diver to terminate the dive that he/she considers unsafe, without fear of reprisal, in a way that does not compromise the safety of another diver already in the water.

Emergencies and Deviations from Regulations

Any diver may deviate from the requirements of this Manual to the extent necessary to prevent or minimize a situation likely to cause death, serious physical harm, or major environmental damage.  A written report must be submitted to the DCB explaining the circumstances and justifications.

2.40 Post-Dive Procedures

Post-Dive Safety Checks

After the completion of a dive, each diver must report any physical problems, symptoms of decompression sickness, or equipment malfunctions to the Lead Diver, DSO, and/or DCB.

2.50 Emergency Procedures

The �黨�ǿ���Ƶ will develop emergency procedures which follow the standards of care of the community and must include procedures and implementation criteria for emergency care, recompression, evacuation, and incident reporting.

 2.60 Flying After Diving or Ascending to Altitude (Over 1000 feet/304 meters)

• Following a Single No-Decompression Dive: Divers should have a minimum preflight surface interval of 12 hours.
• Following Multiple Dives per Day or Multiple Days of Diving: Divers should have a minimum preflight surface interval of 18 hours.
• Following Dives Requiring Decompression Stops: Divers should have a minimum preflight surface interval of 24 hours.
• Before Ascending to Altitude Above 1000 feet (304 meters): Divers should follow the appropriate guideline for preflight surface intervals unless the decompression procedure used has accounted for the increase in elevation.

2.70 Record Keeping Requirements

Personal Diving Log

Each authorized scientific diver must log every dive made under the auspices of the �黨�ǿ���Ƶ’s program and is encouraged to log all other dives.  The �黨�ǿ���Ƶs may allow dives to be logged in any format of �黨�ǿ���Ƶ’s choosing. Logs must be submitted per local protocol and must remain in the divers’ file. The dive log must include at least the following:

• Name of diver and buddy
• Date, time, and location
• Diving modes used
• General nature of diving activities
• Maximum depth and dive time
• Diving tables or computers used
• Detailed report of any near or actual incidents

Required Incident Reporting

All diving incidents requiring recompression treatment, or resulting in moderate or serious injury, or death must be reported to the �黨�ǿ���Ƶ’s DCB and AAUS in a timely manner. The �黨�ǿ���Ƶ must record and report occupational injuries and illnesses in accordance with requirements of the appropriate Labor Code section. The �黨�ǿ���Ƶs must investigate and document any incident of pressure-related injury and prepare a report that is to be forwarded to AAUS during the annual reporting cycle.

• If pressure-related injuries are suspected, or if symptoms are evident, the following additional information must be recorded and retained by the �黨�ǿ���Ƶ, with the record of the dive, for a period of 5 years:
• Written descriptive report shall include:
• Name, address, phone numbers of the principal parties involved.
• Summary of experience of divers involved.
• Location, description of dive site, and description of conditions that led up to incident.
• The circumstances of the incident and the extent of any injuries or illnesses.
• Description of symptoms, including depth and time of onset.
• Description and results of treatment.
• Disposition of case.
• Recommendations to avoid repetition of incident.

In addition to requirements specific to the �黨�ǿ���Ƶ, all diving incidents will be reported to the AAUS. This report must first be reviewed and released by the �黨�ǿ���Ƶ’s DCB and at a minimum contain:

• Complete AAUS Incident Report.
• Summary of experience of divers involved.
• Description of dive site, and description of conditions that led up to incident.
• The circumstances of the incident and the extent of any injuries or illnesses.
• Description of symptoms, including depth and time of onset.
• Description and results of treatment.
• Disposition of case.
• Recommendations to avoid repetition of incident.

3.10 General Policy

All equipment must meet standards as determined by the DSO and the DCB.  All equipment must be regularly examined by the person using it and serviced according to manufacturer recommendations.  Equipment that is subjected to extreme usage under adverse conditions should require more frequent testing and maintenance.

3.20 Equipment

The �黨�ǿ���Ƶ’s DCB must establish the minimum equipment configuration for all dives.

Regulators and Gauges

• Scuba regulators and gauges must be inspected and tested prior to each use and serviced, at a minimum, according to manufacturer’s recommendations
• Standard open circuit (OC) regulator configuration is:
  • A first stage
  • Primary 2^nd stage
  • Back up 2^nd stage
  • Submersible Pressure Gauge (SPG)
  • Inflator hose for a Buoyancy Compensator Device
• A Full Face Mask may be used in place of the primary 2^nd stage according to manufacturer’s recommendations

Equipment for Determination of Decompression Status

• Each member of the buddy team must have an underwater timing device and depth indicator, or dive computer
• If dive tables are being used a set must be available at the dive location
• If a dive computer is used the diver must use the same computer used on repetitive dives.
• In an aquarium or other manmade structure of a known maximum obtainable depth:
• A depth indicator is not required, except when a diver’s decompression status must be taken into consideration on repetitive dives.
• Only one buddy must be equipped with a timing device.
• The maximum obtainable depth of the aquarium must be used as the diving depth.

Scuba Cylinders

• Scuba cylinders must be designed, constructed, and maintained in accordance with the applicable provisions of the Unfired Pressure Vessel Safety Orders.
• Scuba cylinders must be hydrostatically tested in accordance with DOT standards.
• Scuba cylinders must have an internal and external inspection at intervals not to exceed 12 months.
• Scuba cylinder valves must be functionally tested at intervals not to exceed 12 months.

Buoyancy Compensation Devices (BCD)

• Each diver must have the capability of achieving and maintaining neutral buoyancy underwater and positive buoyancy at the surface.
• BCDs, dry suits, or other variable volume buoyancy compensation devices must be equipped with an exhaust valve.
• These devices must be functionally inspected and tested at intervals not to exceed 12 months.
• BCDs, dry suits, or other variable volume buoyancy compensation devices must not be used as a lifting device in lieu of lift bags.

3.30 Auxiliary Equipment

Handheld Underwater Power Tools

• Power tools and equipment used underwater must be specifically approved for this purpose.
• Tools and equipment supplied with power from the surface must be de-energized before being placed into or retrieved from the water.
• Handheld power tools must not be supplied with power from the dive location until requested by the diver.

3.40 Support Equipment

First Aid Supplies

• A first aid kit and emergency oxygen appropriate for the diving being conducted must be available at the dive site.

Diver’s Flag

• A diver’s flag must be displayed prominently whenever diving is conducted under circumstances where required or where water traffic is probable.

Compressor Systems – Organizational Member Controlled

The following will be considered in design and location of compressor systems:

• Low-pressure compressors used to supply air to the diver if equipped with a volume tank must have a check valve on the inlet side, a relief valve, and a drain valve.
• Compressed air systems over 500 psig must have slow-opening shut-off valves.
• All air compressor intakes must be located away from areas containing exhaust or other contaminants.

3.50 Equipment Maintenance

Record Keeping

Each equipment modification, repair, test, calibration, or maintenance service must be logged, including the date and nature of work performed, serial number of the item (if applicable), and the name of the person performing the work for the following equipment:

• Regulators
• Gauges (SPG, Depth Gauges, Timers, and Dive Computers)
• BCDs
• Dry suits
• Scuba cylinders and valves
• Full Face Masks
• Compressors, air filtration systems, gas control panels, and storage banks
• Surface supplied equipment
• Rebreather systems
• Additional equipment categories as determined by the DCB

Compressor Operation and Air Test Records

Gas analyses and air tests must be performed on each �黨�ǿ���Ƶ-controlled breathing air compressor at regular intervals of no more