They won't be. Heaven and Earth will be moved to retrieve the bodies. They are only halting rescue operations.
And in 100's of feet of water, yeah, some divers (presumably the SAR kind) cannot go that deep. Other divers (and certainly immersible craft) can.
If they can retrieve part of Soviet nuclear sub (the Hughes Global Surveyor operation), they’ll bring up that amtrak once the resources are in place. My guess is they’ll bring it up before the week is out.