(≧∀≦)/
LOL~ Lets not question that. I mean the mangaka must have applied yaoi logic there. So theres nothing we can say about it
It is the same logic as living in a pineapple under the sea.
...ha..
Instead of yaoi logic, I think it's correct to say spongebob logic coz you know, there's a designated place for swimming like their Goo Lagoon (basically their beach)...even though they're already LIVING IN ONE....
... they're sweating .... in the middle of the SEA???