I just went through Blockade Buster and sank all three ships without raising an alarm on any of the ships.
(I didn't choose to assassinate the Captains, though, would've caused too much commotion)
I feel very accomplished today.
(But I hate wary Kobolds now more than ever)
(Also the fact that interacting with the controls breaks your invisibility and sneak when the Kobold is right next to the dang thing)
But the game gave me a Treasure Chest at the raft for my troubles!