If they're going to sink the ship, the should sink in a place where it can become an artificial coral reef and scuba diving destination--either in the Caribbean or the Pacific. It is a terrible waste to sink it 300 miles in the middle of nowhere.
They are sinking her in the deep Atlantic, most likely because they need a healthy zone they can police against surveillance and intrusion, and also so that the ship will not be as easily entered by scuba teams from unfriendly intelligence services. This is the ONLY super-carrier we are tossing away, and its design has much in common with all the other super-carriers. Its submerged site will require remotely piloted drones at the depths planned. Don't know if the Chinese or Russians are quite up to speed in that dept. yet.