Underwater Firearm is really a solution?

When it comes to experiments, most scientists are not afraid to take risks. This also happened to Norwegian scientist Andreas Wahl who carried out extreme research. To prove the difference in resistance between air molecules and water molecules He let himself to be fired by a firearm! At first, He placed a loaded assault firearm on a tripod underwater in a swimming pool, equipped it with a stringer connect to the trigger, then He stood several feet in front of the firearm. After everything is ready, He pulled the string on himself. The result was interesting, a bullet fired from firearms begins slowing down until it fell to the bottom before getting anywhere near Wahl.

See the full experiment here:

From that experiment, Wahl showed that standards bullets become ineffective, inaccurate, and lose its lethal ability underwater. It happens that water molecules are closer together than air molecules make it hard to create movement in underwater. So you need a specially designed firearm to be able to shoot underwater (underwater firearms). Underwater firearms have a special design that allows the bullet kept stabilized by cavitation principles. Here are examples of underwater firearms around the world:

  • SPP-1 and SPP-1M underwater pistol

The SPP-1 underwater firearm was made by Soviet Union to be used for police or military underwater. It has four smoothbore barrels in a square cluster near the trigger guard. With few modifications, the SPP-1 was upgraded to SPP-1M. It has extra spring to improve the trigger pull and its trigger guard is larger than SPP-1. The effective range of the SPP-1M is about 17 meters at a depth of 5 meters, the range decreases as depth increases. Both SPP-1 and SPP-1M can be fired out of the water, but its accuracy is highly reduced. (Source https://en.wikipedia.org/wiki/SPP-1_underwater_pistol)

  • The Mk.1 underwater defense gun

Not to be outdone by Soviets, the United States Navy SEALs and Underwater Demolition Teams developed an underwater weapon called The Mk.1 underwater defense gun. It has six rounds inside a large cylindrical magazine which fits into the side of the gun. This firearm had an effective range is about 9 meters at a depth of 18 meters. (Source https://warisboring.com/yep-the-navy-had-an-underwater-revolver/)

  • APS underwater assault rifle

APS also an underwater firearm designed by the Soviet Union in the early 1970s. The APS designed has 26 rounds in its magazine, firing both semi-automatic and fully automatic. Its underwater effective range also varies due to the effect of water depth pressure. At a depth of 5 meters, APS can fire until 200 meters. This weapon has a self-adjusting gas system to make sure the owner does not have to manually adjust as he swims into deeper or shallower water. (Source https://nationalinterest.org/blog/buzz/meet-aps-spetsnaz-rifle-russian-gun-fires-underwater-40747)

Supercavitating bullets(Underwater bullets)

Underwater firearms are indeed very helpful when fighting underwater. However, this special designed firearms only effective in the water situation. It is unable to use in the open air. Fortunately, Duretek Co., Ltd, has developed an underwater bullet that compatible with a regular firearm called GP Bullet. It can be applied to various warheads and do not need to require a special firearm to use it. You can read this article to know more about GP bullet (https://roaringengine.com/2019/04/04/introducing-gp-bullet-a-multifunction-supercavitation-ammunition-to-complete-your-strategy/)