The boat proceeded to sink or damage another eight ships; many of them resting on the sea bed in the shallow water with parts of their hulls above the surface. One such was "Oklahoma" which, although sent below in of water on 8 April, was re-floated, repaired and returned to service in December 1942. Another vessel, "Gulfamerica" was fatally struck about five miles from Jacksonville, Florida on 11 April. The ship had been on her maiden voyage from Philadelphia to Port Arthur, Texas, with 90,000 barrels of fuel oil. Nineteen crewmen were killed in the attack. She did not sink until 16 April.