Oh my apologies, I did not intend to imply it's impossible to get down there, just that the resources needed to recover the treasure aren't ones that can be surreptitiously obtained. There just aren't all that many ROVs in the world capable of this work, so while the act of getting down there and looting it isn't difficult, getting away with it after the fact is the challenging part.

(also the depth claim is... well there's a few reasons to be skeptical of it. This whole saga is already rife with accusations of coverups and intentional deception, and both parties involved are incredibly motivated to lie about it for their own gain. It's good to take anything either side announces with a big ol' skepticism pill...)