The 4.5 mm SPP-1 Underwater Pistol was made in the USSR for use underwater by Soviet frogmen as an underwater firearm.[2] It was developed in the late 1960s and accepted for use in 1971. Underwater, ordinary-shaped bullets are inaccurate and very short-range. As a result, this pistol fires a round-based 4.5 mm caliber steel dart about 115 mm long (about 4.5 inches), weighing 12.8 g, which has longer range and more penetrating power than speargun spears. The complete cartridge is 145 mm long (about 5.7 inches) and weighs 17.5 g.[6]