So? The idea is batshit insane, but I'm not sure it's against physics. Imagine a supercavity nuclear powered submarine cargo ship. I can't run the calculations

So? The idea is batshit insane, but I'm not sure it's against physics. Imagine a supercavity nuclear powered submarine cargo ship. I can't run the calculations for that. It would probably kill/scare all whales left in the ocean, but it might "work".