So, I jumped into a game and sailed around for a few minutes when all of a sudden my ship goes underwater, but it wasn't sinking I could still steer it. I could see the outline of the Ghost Captain on the Ferry of the damned very far away.
Got kicked from the game, because I lost connection.
And that just got me thinking. What if you could sail underwater as a feature, kinda like the Flying Dutchman from Pirates. I think that would add some really cool elements to being either pirate legend or pirate legend captain.