[aavci]

What would the engine with this look like? Does it cause a lot of noise or any other damage to sea life?

[dsr_]

It's a heavy black box which emits neutrons.

The good news is that neutrons are easily absorbed by steel and water.

The bad news is that the resulting irradiated steel isn't anywhere near as strong as it was pre-irradiation.

https://www.science.org/content/article/fusion-power-may-run...