Solve the riddle!

[CarribeanThunder]

Originally Posted by The Evil Will Mcbain

Um, the big ships in the fleet events. Aren't they all the same size?
From what island is the invasion music?

"Um, the big ships in the fleet events." I knew someone would say that. The clue word in the riddle is "was." I'm sure someone can figure it out now.

The Invasion Battle theme is the battle theme from Isla Tormenta, though not sure of the 30 Minute Wait song.

Again, what was the biggest ship ever in POTCO history? You've all been through it
( I'm only using this one again because I haven't thought of another... )