Claim: The Japanese escort Ishigaki was based in Kuriles and sank the submarine the USS Gibson on 7 October 1943 during World War II.
Evidence: On 7 October 1943, Ishigaki sank the submarine USS S-44. Ishigaki (石垣) was one of four Shimushu-class escort ships built for the Imperial Japanese Navy during World War II. Based in the Kuriles, she patrolled and escorted convoys and ships there.