They are about 400 miles off the coast of Boston, in about 12,000 feet of water and communication has been lost since Sunday. No signs on the surface, no communications from below. It's not looking good. I'm guessing there a crack/implosion or their oxygen system/rebreather failed and everyone passed out. I think there would be ways of dumping ballast and surfacing even if power were lost and I'd think back communications gear would be available especially for the surface. So, the options as to what happened don't look good.