Either I’m misunderstanding you, or you’re misunderstanding the situation. They are not pulling heat from the ocean, they are adding to it. And unfortunately that heat is doing a bad job of raidiating into space.

Why, is there a second one somewhere?

Well now we’re talking about the uterus, which has all sorts of other unfun side effects, including (at minumum) monthly nonstop days-long gut punches

Aside from everything already stated … pushing a whole ass baby out of a vagina is already a moderately unpopular activity

A smaller and slightly longer tube is unlikely to be an improvement