It is the deepest-known shipwreck in the world. Now a submersible has reached USS Johnston, which sank during the Second World War and lies 6.5km beneath the Philippine Sea. The 115m-long Fletcher-class destroyer sank in the Pacific Ocean during the Battle off Samar on 25 October 1944. Johnston was later awarded a Presidential Unit Citation, the highest award that can be given to a ship. Although first discovered in 2019, the submersible DSV Limiting Factor this time reached depths previous underwater vehicles could not.