Fiji
Between April and September, 1943, I-19 was stationed off Fiji. During this time, the submarine sank two and heavily damaged one Allied cargo ship. After sinking one of the ships SS William K. Vanderbilt on May 16, 1943, I-19 surfaced and machine-gunned the surviving crew members in their lifeboats, killing one of them.
Read more about this topic: Japanese Submarine I-19