[bradknowles]

This is not a new concept. You can see a discussion of this technique being used (to a degree) on battleships in WWII, by watching some of the videos on the Battleship New Jersey YouTube channel.

There’s also a Russian torpedo that uses a similar concept to “fly” at supersonic speeds underwater.

[corv]

> There’s also a Russian torpedo that uses a similar concept to “fly” at supersonic speeds underwater.

Supercavitation

[bradknowles]

Is it supercavitation or is it riding in a bubble of steam that it creates ahead of itself?

Either way, it’s effectively flying through the air bubble underwater, which was the concept I was thinking of.