The main tasks of modern non-nuclear or diesel-electric submarines are surveillance, reconnaissance and intelligence. For these types of missions, the submarine operates in the shallow waters of coastal areas for longer times.Furthermore, submarines on intelligence missions generally have no permission for weapon employment, so they pose little threat to hunting surface vessels. Though in military terms the threats these subs pose is normally "white," their nonthreatening, stationary nature can cause considerable difficulty for ships attempting to detect them using traditional anti-submarine warfare (ASW) sonar methods.
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