I've heard Raekwon mention underwater or marine lines a lot of times in his songs. I don't know what he's talking about. If someone can explain what the lines reference. I'll post these two lines as an example:

"Rainbow dough was the emmo
So many flavours yo,
Buy your neighbour off underwater vault
Then I met him, Colombian name Flako
Had the whole block locked selling tons in Morocco
"

Apollo kids:

"rock boats under water, watch clams"

These aren't the best examples, but if you listen to a lot of Rae's songs he talks about underwater and marine shit a lot.