Currently there are two methods for detecting them. The first involves a ship equipped with sonar, the second a helicopter dragging sonar in the ocean. Both methods are slow. In order fro the ship to avoid locating a mine by detonating it, it has to maneuver very carefully and slowly. Using a diver to identify suspicious objects is not only very dangerous but also slows the process.
Divers have to come up every so often.
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