Nautilus grabbing dirt from the ocean floor

“We dredge some stuff up from the bottom, too,” said Devon. “Mix it in with everything to make better dirt.”
Madelyn looked at the man. “From the bottom of the ocean? That’s, like, a mile down.”

Excerpt From Ex-Isle, pg 315
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017