It was like an age ago, but i think it was regular scry+teleport. They INSIDE the ship, near the cargo, and made a hole in the base (can't be arsed to remember how, I think Desintegrate). The hole was big enough to make me conclude the ship sank, unless serious and heavy handweaving (which I dont like). They did it at midnight, most pirates were sleeping, and really, if a ship at midnight with a huge hole just in it's base does not sink, then it wont sink EVER. Sure, the pirates made some efforts, and the main NPC there saved their lives. But the race for the sunken city was over.There isn't enough information to go on here, but let us discuss.
I am assuming that this was a Teleport Without Error? Otherwise, so sad to end up in another ship's bilge (perchance, for without actually going topside, how does the teleporter know what ship he is on?).
You left out how he sunk the pirate ship. Did it sink instantly? Were there no bilge pumps, and no materials for emergency repairs? Was there no chance of a pirate discovering our caster augering out the bilge? Was there no time for the pirate ship to turn and try to capture the PC's ship to replace their own?
RC
The pirate ship was a TON of miles away, so no chance to get to the players ship before it sunk