In May 1945, Bob Clark fleeted up to Commanding Officer (CO) for one more war patrol on the SENNET (1 July-9 August 1945). The SENNET entered the Sea of Japan through the narrow trench in the heavily mined Tsushima Straits, sank 4 Japanese merchant ships, and returned to safety through the La Ferouse Straits - despite a virtually depleted oxygen supply. The SENNET returned to base a week before World War II ended. This was the last full-fledged convoy battle of the Pacific Campaign. Bob was awarded the Navy Cross for this action and the entire crew became members of the Mighty Mine Dodgers Society.
Clark was also a member of the US Submarine Veterans Holland Club with over 50 years of being qualified in submarines.