10. Tending line
1. See paragraph 17-4.2
2. See paragraph 17-4.2.6
17-4.2.1 Distance Line. Any buddy line over 10 feet (3 meters) in length is referred to as a distance line. The length of the distance line shall not exceed 81 feet (25 meters). Distance lines shall be securely attached to both divers.
17-4.2.2 Standby Diver. When appropriate during training and non-influence diving operations, open circuit scuba may be used to a maximum depth of 130 fsw.
17-4.2.3 Lines. Diver marker lines shall be manufactured from any light line that is buoyant and easily marked as directed in paragraph 17-4.2.4 (one-quarter inch polypropylene is quite suitable).
17-4.2.4 Marking of Lines. Lines used for controlling the depth of the diver(s) for decompression diving shall be marked. This includes tending lines, marker lines, and
17-4.2.5 Diver Marker Buoy. Diver marker buoys will be constructed to provide adequate visual reference to monitor the divers location. Additionally, the amount of line will be of sufficient length for the planned dive profile.
17-4.2.6 Depth Gauge/Wrist Watch. A single depth gauge and wrist watch may be used when diving with a partner and using a distance line.
17-4.3 Recompression Chamber Considerations. A recompression chamber and a Diving Medical Officer are not required on station (on station is defined as at the dive location) as prerequisites for closed-circuit UBA diving operations, unless the dive(s) will exceed the normal working limit. However, the following items should be determined prior to beginning diving operations:
Location of the nearest functional recompression chamber. Positive confirmation of the chamber's availability in case of emergency should be obtained.
Location of the nearest available Diving Medical Officer if not at the nearest recompression chamber.
■ Location of the nearest medical facility for treatment of injuries and medical problems not requiring recompression therapy.
The optimal method of transportation to the treatment chamber or medical facility. If coordination with other units for aircraft/boat/vehicle support is necessary, the Diving Supervisor shall know the telephone numbers and points of contact necessary to make these facilities available as quickly as possible in case of emergency. A medical evacuation plan should be included in the Diving Supervisor brief. Preparing an emergency assistance checklist similar to that in Chapter 6 is recommended.
17-4.4.1 Employing a Single, Untended EOD Diver. Generally, it is safer for divers to work in pairs rather than singly. However, to do so when diving on underwater influence ordnance doubles the diver bottom time expended, increases the risk to life from live ordnance detonation, and increases the risk of detonation caused by the additional influence signature of the second diver. The EOD Diving Officer may authorize the employment of a single, untended diver when it is deemed that the ordnance hazard is greater than the hazard presented by diving alone. All single, untended divers must use a full face mask (FFM). The EOD Diving Officer or Diving Supervisor shall consider the following factors when deciding whether to operate singly or in pairs:
17-4.4.2 Simulated Training Scenarios. Simulated ordnance training scenarios do not constitute a real threat, therefore single untended divers shall not be used in training operations. The diver shall be surface tended or marked by attaching a buoy to him.
17-4.4.3 EOD Standard Safety Procedures. The following standard safety procedures shall be observed during EOD diving operations:
An EOD Diving Officer shall be on scene during all phases of an explosive ordnance disposal diving operation involving a Render Safe Procedure (RSP).
■ When diving on unknown or influence ordnance, the standby diver's equipment shall be the same type as the diver neutralizing the ordnance.
17-4.4.4 Diving Methods. Diving methods include:
Single Marked Diving. Consists of a single diver with FFM marked with a lightweight buoyant line attached to a surface float. Upon completion of a dive requiring decompression, the diver will signal the diving supervisor that he is ready to surface. The diving boat will then approach the surface float and recover the diver.
■ Paired Marked Diving. Procedures for paired marked diving are identical to the procedures for a single marked diver, but with the addition of the second diver connected by a buddy/distance line.
Tended Diving. Tended diving consists of a single surface-tended diver or a pair of divers using a buddy/distance line, with one diver wearing a depth-marked line that is continuously tended at the surface (Figure 17-5). A dive pair working off a master reference buoy is closely and continuously monitored at the surface. Divers shall each be positively attached to the system or one diver positively attached to the system and the other positively attached to the first.
17-4.5 Ship Safety. When operations are to be conducted in the vicinity of ships, the guidelines provided in the Ship Repair Safety Checklist (see Chapter 6) must be followed.
17-4.6 Operational Area Clearance. Notification of intent to conduct diving operations should be coordinated in accordance with local directives.
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