When the Navy learns that Japanese freighters are hugging the coast of Japan in order to evade US submarines, the Trigger is sent to the area to lay mines to force Japanese shipping out into deeper waters. USS Trigger (SS-237) a Gato-class submarine. From 3 Dec 1942 to 22 Jan 1943, the submarine conducted a combined minelaying and offensive patrol, in waters surrounding Japan. On 20 December, she...