one with a depth charge. Their bodies were recovered and their swimfins later used by Gibraltar's guard divers (Sydney Knowles and Commander Lionel Crabb). This was the first known British use of swimfins. In November 1944, following surrender of Italian forces an Italian frogman brought two Decima Flottiglia issue oxygen rebreathers and a 2-piece frogman's drysuit to Livorno, for the Allies to use. This equipment proved better than the Davis Apparatus and lasted longer on a dive. After the war and until the 1990s divers used the Siebe Gorman rebreather and aqualung. Training to become a Clearance Diver takes around 7 months. Before trainees are accepted onto a course, they must pass a week-long diving aptitude selection, held at the Defence Diving School, on Horsea Island, Portsmouth. This selection involves passing the Divers Physical Fitness Test (DPFT), tests of physical and mental endurance and surface swimming. The candidates are also introduced to the Royal Navy's Swimmers Air Breathing Apparatus and dive in Horsea lake, including night dives. Historically, the failure rate has been high due to the physical and psychological pressures of military diving, so there is a three-day Pre Entry Diving Acquaint (PEDA), which allows prospective candidates to undergo physical and mental tests to give them a better idea of what to expect of the training. The diving branch is formed of teams, that serve aboard mine hunters, perform domestic bomb, mine and IED disposal and the two Fleet Diving Groups (FDG). Expeditionary Diving Group (EDG) comes under 3 Commando Brigade specialising in Very Shallow Water (VSW) beach reconnaissance operations, working alongside UK Special Forces (UKSF). New members are trained in parachuting, maritime counter-terrorism (MCT) tactics and swimmer delivery vehicle (SDV) operations. Tactical Diving Group (TDG) is the deep-water warfare unit who specialise in sea mine disposal. Members cross-train with EDG. Clearance divers have been involved in every major British conflict since their inception and have most recently deployed teams to Iraq, Afghanistan and Libya. They have units operating in the Persian Gulf and Indian Ocean providing an underwater force protection (UWFP) element. See Operation Kipion. From 2022 Royal Navy Divers will come under the Diving & Threat Exploitation Group (DTXG) based in Portsmouth, Plymouth and Faslane. It comprises: A Squadron (formerly Tactical Diving Group) Special operations squadron - Horsea Island, Portsmouth. B Squadron (formerly Southern Diving Group) Homeland Defence and IWMAR diving to SURFLOT, geographically distributed between Horsea