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Treaty for the Limitation and Reduction of Naval Armaments, (Part IV, Art. 22, relating to submarine warfare). London, 22 April 1930.
Part IV - Art. 22.
Art. 22. The following are accepted as established rules of international law:
(1) In their action with regard to merchant ships, submarines must conform to the rules of international law to which surface vessels are subject.
(2) In particular, except in the case of persistent refusal to stop on being duly summoned, or of active resistance to visit or search, a warship, whether surface vessel or submarine, may not sink or render incapable of navigation a merchant vessel without having first placed passengers, crew and ship's papers in a place of safety. For this purpose the ship's boats are not regarded as a place of safety unless the safety of the passengers and crew is assured, in the existing sea and weather conditions, by the proximity of land, or the presence of another vessel which is in a position to take them on board.
The High Contracting Parties invite all other Powers to express their assent to the above rules.