Sub Maintenance Students perform maintenance on their human-powered submarine outside of the David Taylor Model Basin during the 15th International Submarine Races at Naval Surface Warfare Center’s Carderock Division in Bethesda, Md, June 24, 2019. SHARE IMAGE: Download Image: Full Size (2.64 MB) Tags: Armed With Science Photo By: VIRIN: 190624-N-OR058-075.JPG Photo Gallery