It says its using lasers to vaporize seawater all around the submarine which would create a submarine sized super cavity which would have very very low resistance. The problem is what happens when the bubbles collapse. That's what causes the cavitation noise, its when the bubbles collapse. They can do so with such force that they can pull metal out of nearby surfaces.
Yah. Meanwhile elsewhere people have torn apart the news. Seems that it is just a concept, no test in reality at all, not even parts of it in a lab. Maybe late april joke?
