The British WWII submarine HMS Trooper was found in the Aegean Sea 81 years after it vanished during a secret mission in 1943. Lost with all 64 crew members, it likely sank due to a mine explosion while patrolling an area heavily mined by the Germans. Underwater researchers used advanced sonar and unmanned ROV technology to locate the wreck at a depth of 253 meters. This discovery helps bring closure to families of the lost sailors and serves as a reminder of their sacrifice.