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One of the many power tools operated underwater by Clearance Divers is the Pneumatic Drill. The drill uses pneumatic power (air pressure) rather than electricity, supplied by hoses from a boat on the surface of the water. It is commonly used to drill into ships' hulls when adding or replacing sensor and other equipment.
In this role, Clearance Divers install, maintain and repair ships' underwater fittings and Naval Harbour installations. Diving on air equipment (both self contained and surface supplied), these divers are skilled in various underwater salvage techniques.
In Battle Damage Repair we do real jobs and see real results almost every day.
Equipment used in underwater battle damage repair has to be seen to be believed. It includes a drysuit with connected helmet that provides air supply to the diver, a pneumatic drill and a giant pneumatic chainsaw, both powered by air pressure.
Clearance divers use both fully enclosed helmets and Band masks that connect to either a wetsuit or drysuit. When diving on 'Surface Supplied', the air is supplied to the diver's helmet from a boat on the surface, via a long cable called an 'umbilical'. The umbilical carries an air hose, a communications hose and a hose for measuring diver's depth.
Unlike a traditional wetsuit, a drysuit is completely waterproof, keeping all water out and the person wearing it totally dry. This protection from the elements allows the diver to stay underwater for extended periods of time, especially in cold water and can protect him from hazardous materials involved in exercises such as underwater welding. Made from a combination of nylon and rubber, the drysuit is loose and flexible to allow air to pass around the body and provide freedom of movement. It connects to a helmet via a steel ring at the neck.
A traditional chainsaw with a combustion motor would not work underwater, so Clearance Divers use one that is specially designed to run on the pneumatic (air pressure) power, supplied by hoses from a boat on the water's surface. An underwater chainsaw is useful for clearing submerged trees and other items that may be blocking a pathway and also for cutting off supporting posts on broken, disused wharfs that may be hazardous to passing shipping.
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