[T.B. Yoits]

It's the Navy; feed them kelp.

Seriously though, they should be eating shark steaks.

[Jamestown1630]

Food on submarines is apparently excellent:

https://www.popularmechanics.com/military/navy-ships/a14764350/everything-you-wanted-to-know-about-food-on-a-us-submarine/

https://freerepublic.com/focus/f-chat/3760232/posts