Sean: You know, if we die down there, mom is gonna kill us.
Hank: It looks like the liquefation has tripled overnight.
Kailani: What does that mean?
Hank: It means this island is sinking a lot faster than we thought.
Alexander: I thought you said a couple of days.
Hank: Now it looks more like a couple of hours.
Sean: A couple of hours?
Hank: We need to get to that sub now or we're all gonna be 20,000 leagues under the sea.
Alexander: I wanted to give you this.
Sean: A book?
Alexander: Oh, it's not just a book. It's a trip I want us to go on, all of us, as a family.
Sean: From the Earth to the Moon.
Alexander: What do you say?
Kailani: I think there's only one thing to say.
Sean: So, who's up for an adventure?
Liz: No, no, no.
Hank: Oh honey, what could possibly go wrong? It's only the moon.
Alexander: Who's up for an adventure?
Answer: There is a deleted scene on the DVD/Bluray where they attempt to give an explanation. Kailani asks "What happens to the animals when the island sinks? They can't all die!". Alexander replies "Even the mammals develop quasi-amphibian characteristics. They just burrow below the ground's surface and absorb the oxygen through their skin."
Sierra1 ★