Definitely looks like an artifact left after layering different photo runs. I've seen similar shapes etc before, BUT, I sincerely doubt that we DON'T have underwater facilities. Interesting fact, the say that we have only explored 20% of the entire ocean and waters on this planet. The likelihood of there being a race of living entities that exist beyond our perview is actually quite high. I realize jumping to aliens is a huge leap but dialing that back then, saying that we as humans have underground, under lake, under ocean, under continent structures that can support life is a mild stretch.

Remember, they say Jizzlane Maxwell had her Submarine pilots license. That would mean She had access to submarines, which means access to underwater docks, which means underwater structures. Oh yeah, I'm going there.

In the case of this picture it looks like an artifact of processing, but for the sake of keeping it real, that could very well be a building, but, if it truly was a building then they would have camouflaged it, and in the satellite image you would see a repeat pattern of water, like they do in Antarctica.

/Rant

Carry On!!!