Underwater weapons

Then make it flat and let it bounce.

When an incompressible fluid flow meets an immovable barrier, a "water hammer" effect happens.

It causes immediate local growth of pressure up to ~ (FluidDensity * FlowVelocity * SoundSpeedInTheFluid) value.

That's why the hydraulic valves have to be closed gradually, otherwise you get a water hammer in your pipeline where the valve stops the water flow, and this can must burst your pipe.

A cumulative shell also works this way, you get a super-high local pressure when the metal funnel gets collapsed under the external explosion pressure, and its liquified metal makes a water hammer spreading out into the desired direction.

The same when you splash onto water with a flat back.

According to wiki the mentioned Shkval launch speed is just ~25 m/s.

If you shoot a railgun shell into the water at, say, 1000 m/s speed, when the shell meets the water you can get pressure ~ 1030 * 1000 * 1400 = 1.4 GPa, which is several times greater than a steel ultimate tensile strength.

So, an underwater shot would hit your own submarine like a depth charge.Underwater weapons

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