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Cave diving guide line reel. A distance line, penetration line, cave line, wreck line or guide line is an item of diving equipment used by scuba divers as a means of returning to a safe starting point in conditions of low visibility, water currents or where pilotage is difficult.
Shot, line and reel on dive boat. The shot is deployed, generally from a boat, after the dive site is located using position fixing such as GPS and an echo sounder. Shots are more difficult to use in strong currents. The weight may drag along the seabed especially if the divers pull on the line as they descend.
The Diver Life Raft and Surf Shuttle are inflatable safety devices for diving where currents or distance could create a life-threatening situation if the diver is separated from the dive boat. They are intended as flotation aids for lost divers or those facing long surface swims. [ 70 ]
The diver must be able to safely reach a reliable alternative source of breathing gas at all times during the planned dive. Plans for technical contingencies may include arrangements for alternative equipment, spares, alternative boat etc. The level of contingency planning will depend on the project, and the importance of the task.
A liveaboard dive boat on the Similan Islands, Thailand Deck of a dive boat for about 35 divers, with equipment and whiteboard for dive planning. A dive boat is a boat that recreational divers or professional scuba divers use to reach a dive site which they could not conveniently reach by swimming from the shore. Dive boats may be propelled by ...
Clearing a flooded demand valve is both a routine procedure and an emergency procedure. It is an emergency procedure because if the DV is not cleared, the diver could aspirate water and choke, but it can easily happen, and will happen when a diver switches to a different gas supply delivered through a different DV, and there are two easy ways to deal with it, so it should not be a problem on a ...
Diver unable to return to unattended boat. Boat crew may use a positive check system to identify that each diver is on board after a dive. Divers may carry a yellow flag or surface marker buoy to attract attention. Divers may carry a personal submersible EPIRB or vhf radio. Divers may carry a signalling mirror and/or sound signalling device.
This provides information to the surface that the diver is about to ascend, and where he is. This equipment is commonly used by recreational and technical divers, and requires a certain level of skill to operate safely. They are mostly used to signal the boat that the diver has started ascent or to indicate a problem in technical diving. [93 ...