ok well as you now know ships are sinkable? you didnt know, now you do, this is how you do it.
1> get gnomish fireworks x 4
2> get pristine drake scales x2
3> get star ruby crystal x1
4> get otamans fierce
once you have these put them in a black burrow cask and head onto this beautiful ship
at midnight, head below decks, and just round that little corner part < down stairs >
drop the blackburrow cask and start running for your life, then swimming for your life very very fast, must have swimming 200+ once you do this and are far enough away turn around and watch the ship explode