Boys make the best sound effects. My brothers could always do awesome explosion sounds and the sound of a shooting gun.
Watching Max play it is mostly his ships crashing and falling while he sings "Pirates life for me! Pirates life for me!". Such a boy. He is so drawn to superheros, rocket ships, space, boats, pirates, and airplanes. And he already has the awesome crashing and shooting sound effects down.
In the end both ships sank. And then rose back up to crash and sink again.