So the 777 is going to float on its side near the surface like that, a week after it crashes???
IF it crashed at a shallow angle and “only” ripped off its wings, and IF it is in the shallow end of the pool, and IF it is on it’s side, THEN resting on the bottom of a 100 ft deep sea, the fuselage would only have 80 feet of water over it. Less IF it’s not flat on the bottom.
Lots of IFs there...
FWIW, Google Earth shows depth at the spot is 296 feet. Wingspan of 777-200 is 222 ft. On its side? Doesn’t make much sense, but who knows.
On an unrelated note, in the straits between Maui and Lanai, we stopped and jumped into the water. Dropped a quarter into the water and watched it drop. It was still visible after several minutes in the sunlight.
Generally airplanes are thin aluminum with honeycomb composites. They are made to be light. It’s possible things would float, even for a good while.