Predive Procedures

17-5.1 Diving Supervisor Brief. A thorough, well-prepared dive briefing reinforces the confidence level of the divers and increases safety, and is an important factor in successful mission accomplishment. It should normally be given by the Diving Supervisor, who will be in charge of all diving operations on the scene. The briefing shall be given separately from the overall mission briefing and shall focus on the diving portion of the operation, with special attention to the items shown in Table 17-6. MK 16 UBA line-pull dive signals are listed in Table 17-7. For MK 16 UBA diving, use the appropriate checklist provided in the MK16 UBA O&M Manual. It is recommended that the Dive Record Sheet shown in Figure 17-6 be used by Diving Supervisors for MK 16 diving.

17-5.2 Diving Supervisor Check. As the divers set up their UBAs prior to the dive, the Diving Supervisor must ensure that each diver checks his own equipment, that setup is completed properly by checking the UBA, and that each diver completes a UBA predive checklist from the appropriate UBA operation and maintenance manual. The second phase of the Diving Supervisor check is a predive inspection conducted after the divers are dressed. The Diving Supervisor ensures that the UBA and related gear (life preserver, weight belt, etc.) are properly donned, that mission-related equipment (compass, depth gauge, dive watch, buddy lines,

Figure 17-5. Single Surface-Tended Diver.

A. Dive Plan

1. Operating Depth

2. Dive times

3. CSMD tables or decompression tables

4. Distance, bearing, and transit times

5. All known obstacles or hazards

B. Environment

1. Weather conditions

2. Water/air temperatures

3. Water visibility

4. Tides/currents

5. Depth of water

6. Bottom type

7. Geographic location

C. Personnel Assignments

1. Dive pairs

2. Diving Supervisor

3. Diving Officer (Note 1)

4. Standby diver

5. Diving medical personnel

6. Base of operations support personnel

D. Special Equipment for:

1. Divers (include thermal garments)

2. Diving Supervisor

3. Standby diver

4. Medical personnel

E. Review of Dive Signals

1. Hand signals

2. MK 16 UBA Line-Pull Dive Signals (Table 17-7)

F. Communications

1. Frequencies, primary/secondary

2. Call signs

G. Emergency Procedures

1. Symptoms of CO2 buildup

2. Review of management of CO2 toxicity, hypoxia, chemical injury, unconscious diver

3. UBA malfunction (refer to maintenance manual for detailed discussion)

Oxygen sensor failure

Low partial pressure of oxygen

High partial pressure of oxygen

Electronics failure

Low battery

Diluent free flow

Diluent addition valve failure

System flooding

4. Lost swim pair procedures

5. Omitted decompression plan

6. Medical evacuation plan

Nearest available chamber

■ Nearest Diving Medical Officer

■ Transportation Plan Recovery of other swim pairs

H. Times for Operations

I. Time Check

Note 1: EOD Diving Officer is not required on site except during render safe procedure.

Table 17-7. MK 16 UBA Line-Pull Signals.





1 Pull



Arrived at lazy shot (given on lazy shot)

7 Pulls



I have started, found, or completed work.

2-3 Pulls



I have decompression symptoms.

3-2 Pulls



Breathing from EBS

4-2 Pulls



Rig Malfunction

2-1 Pulls



Unshackle from the lazy shot.

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