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After three weeks of searching for worthwhile targets, 'Sea Owl' sank her initial victim, a Japanese destroyer escort, with one Mark 27, which stopped her, and one Mark 18, from about 1000 yd (910 m) ".<unk> After three weeks of searching for worthwhile targets, 'Sea Owl' sank her initial victim, a Japanese destroyer escort, with one Mark 27, which stopped her, and one Mark 18, from about 1000 yd (910 m) ".