HMS H5, was a British H-class submarine of the Royal Navy. She was sunk after being rammed by the British merchantman Rutherglen, mistaken for a German U-boat, on 2 March 1918. All on board perished. Stoker Petty Officer Thomas Lloyd was among the casualties. He, and all the rest of the crew are commemorated on Panel 29 at Royal Navy Submarine Museum. Also on board was US Navy Lt. Earle Wayne Freed Childs from the American submarine AL-2 as an observer, he became the first US submariner to lose his life in the First World War. The wreck site is designated as a controlled site under the Protection of Military Remains Act. A plaque commemorating the 26 who died was dedicated on Armed Forces Day 2010 in Holyhead.