It was January 1942 and the US Army in the Philippines was running out of Anti Aircraft ammunition. The USS Trout was stripped of all of unessential gear and loaded with 3,500 rounds of mechanically-fuzed, high altitude ammunition for the defenders of Corregidor. A submarine was needed to elude the Japanese forces.
After the shells were delivered Trout needed to take on Ballast to allow it to submerge. trout’s request for Sandbags was denies but a compromise was reached. the Army needed to evacuate the Philippine Gold supply to ensure it wouldn’t be captured. So USS Trout took on 20 tons of gold as ballast. Read the full story The Golden Patrol of USS Trout (SS202).