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Unrestricted submarine warfare is a type of naval warfare in which submarines sink merchant ships such as freighters and tankers without warning, as opposed to attacks per prize rules.
Prize rules call for warships to search merchantmen and place crews in "a place of safety" before sinking them, unless the ship shows "persistent refusal to stop... or active resistance to visit or search". To follow the rules a submarine must surface, defeating the purpose of submarines and putting itself in danger of attack.
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