XVExcalibur hailed as first US or UKunderwater drone to let one off in tests A British uncrewed submarine has test fired a torpedo for the first time, demonstrating the ability of undersea drones to attack targets as well as perform reconnaissance and surveillance roles. The XV Excalibur, a 12 meter 40 ft experimental uncrewed underwater vehicle UUV, was unveiled last year as the Royal Navys first large submarine drone as part of Project CETUS. According to the Prime Minister Office, the test...