Water Entry And Descent

Once the predive procedures have been completed, the divers are ready to enter the water. There are several ways to enter the water, with the choice usually determined by the nature of the diving platform. Regardless of the method of entry, the divers should look before entering the water. Three methods for entering the water are the Ladder method Stage method Step-in method 8-9.1 Predescent Surface Check. In the water and prior to descending to operating depth, the diver makes a final...

Diver Communications

The surface-supplied diver has two means of communicating with the surface, depending on the type of equipment used. If the diver is using the MK 21 MOD 1, or the MK 20 MOD 0, both voice communications and line-pull signals are available. Voice communications are used as the primary means of communication. Line-pull signals are used only as a backup. Diver-to-diver communications are available through topside intercom, diver-to-diver hand signals or slate boards. 8-7.1 Diver Intercommunication...

Caution Avoid overinflation and be aware of the possibility of blowup when breaking loose from mud It is better to call

Mud and silt may not be solid enough to support your weight. Many hours may be spent working under mud without unreasonable risk. The primary hazard with mud bottoms comes from the concealment of obstacles and dangerous debris. 8-10.3 Searching on the Bottom. If appropriate electronic searching equipment is not available, it may be necessary to use unaided divers to conduct the search. Procedures for searching on the bottom with unaided divers are 1. A diver search of the bottom can be...

Surface Air Supply Systems

The diver's air supply may originate from an air compressor, a bank of high-pressure air flasks, or a combination of both. 8-6.1 Requirements for Air Supply. Regardless of the source, the air must meet certain established standards of purity, must be supplied in an adequate volume for breathing, and must have a rate of flow that properly ventilates the helmet or mask. The air must also be provided at sufficient pressure to overcome the bottom water pressure and the pressure losses due to flow...

Portable Surfacesupplied Diving Systems

8-4.1 MK 3 MOD 0 Lightweight Dive System LWDS . The MK 3 MOD 0 LWDS is a portable, self-contained, surface-supplied diver life-support system DLSS . The MK 3 MOD 0 LWDS can be arranged in three different configurations and may be deployed pierside or from a variety of support platforms. Each LWDS includes a control console assembly, volume tank assembly, medium-pressure air compressor optional , and stackable compressed-air rack assemblies, each consisting of three high-pressure composite...