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無制限潜水艦作戦
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Wikipedia definition
1. Unrestricted submarine warfare​Unrestricted submarine warfare is a type of naval warfare in which submarines sink merchantmen without warning, as opposed to attacks per prize rules (also known as "cruiser rules"). Prize rules call for submarines to surface and search for merchantmen and place crews in "a place of safety" (for which lifeboats did not qualify, except under particular circumstances) before sinking them, unless the ship has shown "persistent refusal to stop ... or active resistance to visit or search".
Read “Unrestricted submarine warfare” on English Wikipedia
Read “無制限潜水艦作戦” on Japanese Wikipedia
Read “Unrestricted submarine warfare” on DBpedia

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