Supercavitation
The technique of creating air bubbles around underwater projectiles to vastly reduce skin friction drag through the water.
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This remarkable anti-ship weapon would run an innovative boron-powered ramjet engine that works in both air and water. Supersonic in the air and supercavitating under the water, it could strike farther and faster than any conventional torpedo. -
Regular bullets decelerate so quickly in water that they only make it a few feet. But Norway's DSG has used the drag-reducing abilities of supercavitation to produce some extraordinary projectiles that'll hit submerged targets up to 200 feet away.