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Public safety diving team members bring in a casualty Controlling an underwater search from the jetty. Underwater search and recovery is the process of locating and recovering underwater objects, often by divers, [1] but also by the use of submersibles, remotely operated vehicles and electronic equipment on surface vessels.
Diver detection sonar (DDS) systems are sonar and acoustic location systems employed underwater for the detection of divers and submerged swimmer delivery vehicles (SDVs). The purpose of this type of sonar system is to provide detection, tracking and classification information on underwater threats that could endanger property and lives.
Diver searches are underwater searches carried out by divers. There are a number of techniques in general use by commercial, scientific, public service, military, and recreational divers. Some of these are suitable for scuba, and some for surface supplied diving. The choice of search technique will depend on logistical factors, terrain ...
Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Fisher, and National Geographic.
It is semi-intelligent and reportedly can detect an air-filled chest cavity underwater and let its operator tell whether the echo is from a man or something irrelevant such as a seal or dolphin, and to distinguish between: a shoal of fish; a ship's wake; a diver with an open-circuit scuba set; a stealth diver with a rebreather; flotsam and jetsam.
Maintaining underwater security against intrusion on or under the water has been complicated by the expansion of recreational scuba diving since the mid-1950s, making it unacceptable in most democracies to use potentially lethal methods against any suspicious underwater sighting or sonar echo in areas not officially closed to recreational divers.