“Actually, it’s super-easy — barely an inconvenience.”

I’m sure there are big critters pretty deep, but when you’ve got an ecosystem that’s confined to a strip of the deepest party of the Marianas Trench, Meg’s googol-great-grandfather should have eaten the available food and starved. Plus, a creature which has propagated (and thus evolved) for millions of years in a completely lightless environment under enormous pressure isn’t the same as a whale which constantly goes up and down on a daily basis.

Yes, I’m overthinking it… but for $130 million, SOMEONE should have been thinking.

“That works.”

(P.S. As to how a shark that big living that deep could come to the surface without exploding? The same way deep sea submarines do: very, very gradually. While that does still leave the questions of what it’s been eating down there where it can’t get humans and how a creature that’s been living in the dark literally all its life can deal with our sunny surface world… well, the ocean’s got some enormous creatures bigger than the dinosaurs ever were—i.e. whales—living in it, and some of them can go pretty deep for pretty long—like several kilometers for a couple hours at a time on a single breath—in search of their food; I guess the writer of the book series on which The Meg and its sequels are rather loosely based just figured a super-deep-sea shark could do something like what those whales do in reverse.)