How deep does a 9mm Luger penetrate Water?

At the muzzle, a representative 9mm Luger load penetrates approximately 2098 mm (82.6 inches) into water.

What is the impact energy of a 9mm Luger?

This 9mm Luger load carries about 518 joules (382 ft-lb) at the muzzle.

Penetrates to ~83″ before stopping

Penetration depth

2098 mm (82.6″)

Impact velocity

360 m/s (1181 fps)

Muzzle energy

518 J (382 ft-lb)

Bullet behaviour

Intact

Fired at the muzzle, a representative 9mm Luger load (8 g, FMJ, 360 m/s) reaches roughly 2098 mm (82.6 inches) into water.

Water is a dense fluid medium; bullets destabilise and shed velocity quickly.