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Caliber:4.5×40R

Combat divers from the underwater attack was a covert special operations and effective way to deal with combat divers, the usual practice is to train a special anti-frogman dolphins, divers or divers to carry out anti-war, either as attacks on one side or the defensive side of the divers, their traditional self-defense weapons are diving knives and neyzeh guns (Speargun). Neyzeh using canned compressed air gun is fired neyzeh device, in the underwater-launched range depends on its depth, at 5m water depth is about 15m or so, when, and in the 40m deep water, with just about 5m. Neyzeh gun drawback is that larger, carrying inconvenient, but can only play Yi Fa,
Slow loading. However, traditional bullet in the underwater launch ballistic range of extremely close, and unstable, this is because the density of water is 800 times the air, according to some tests, AK-74 in the underwater launch effective range of not more than 1m, M1911 underwater at 0.9m at launch only wooden knocked dent, in the 0.6m it could only penetrate 3mm thick wood.

In order to combat with the enemy against divers have greater tactical advantage, the former Soviet navy in the late 1960s, demand NIITOCHMASH (Central Precision Machinery Research Institute) to develop special underwater pistol, rifle, named SPP-1, is the "special underwater pistol," the abbreviation (Spetsialnyj Podvodnyj Pistolet, the corresponding Russian is Пистолет подводный специальный). Rifle in 1971, the former Soviet Union began to equip the Navy's combat divers unit. SPP-1 was improved and re-shaping for the SPP-1M (Russian СПП-1М),
Currently SPP-1M is still the Russian Navy special forces are equipped and controlled by the Russian government's military sales organization RosOboronExport exported to other countries.

SPP-1 is a manually operated four pistols. The front of the barrel components by a hinge pin on the end of the last, followed by a lock fixed to the Ministry of firing position. When loading such as civilian single-tube or double-barreled shotgun barrel, as Ban Kai, from the barrel rear loading. There is no rifled barrel.

SPP-1 in double-action firing mechanism with a rotating firing pin, each time pulling the trigger when the firing pin back into the outgoing positions, while firing pin block will be rotated 90 degrees the next alignment position of a barrel is not fired.

In the end of the pistol has a pull to the left, there are three functions, at the top is open when the barrel for filling in the middle position is "insurance" and pull in the end the Ministry is "firing" state.

SPP-1 underwater pistol SPS using a special underwater ammunition, firing a long, thin flechette warhead. 40mm long flange using a bottleneck-shaped watertight casings, bullets are made from low carbon steel, spring diameter 4.5mm, length 115mm, weight 12.8g. Full elastic length 145mm, weight 17.5g. The Arrow missile tip top of the shell is flat, it pipes through musket firing, rely on hydrodynamic effects to stabilize, and because of the explosive propellant stronger than the compressed air, so SPP-1 underwater pistol in the water under the effective range and penetration than in the past used neyzeh stronger diver.
In its effective range can easily penetrate inside the warm wet suit or a 5mm thick plastic mask serious injury to divers after. However, this Arrow missile in the air, flying is not stable, so the water use effective range is very limited, usually only used in emergency response.

A complete set of SPP-1 equipment, including a pistol, 10 with four bombs made cluster bombs boxes, holsters, and one can carry a Holster and 3 boxes of special strap bombs.

SPP-1M-type pistol with the SPP-1 is basically the same type, the major improvement has two aspects, one at the trigger rod adds a spring to improve the trigger button power, and second, the trigger guard ring to accommodate the increase in thick diving gloves.