Down below in the dining room, Lani, Irving, and Cal look upward, reacting to the same sound.
Lani: Um... What's that noise?
Outside, the rumbling turns to a WHOOSH, as a spray of red, ghostly water rises underneath the Mantaluna. And with a sudden movement, it BUDGES upward.
In the dark of the cave, the ship has been lifted off of its icy pedestals, and now rests on a curved scarlet wave.
Lani (offscreen): ...OH! Ohhhhh. We're moving.