[CaptainCrunch]

I have questions.

I'm assuming that they aren't in communication with the sub. I mean I get that I'm thinking too short of depth but an Ohio Class submarine uses VLF to be called to the surface using like a single letter.

Also you'd think a sub like that would have an "I'm dead Buoy" with a long cable attachment.

The concept of the I'm dead buoy is it could be released to the surface manually or in the event that the sub turtles, and it would store the subs last location on it.

I'm assuming that the first thing that the crew would do if they were alive would be to automatically go into battery saving mode, shut everything non essential off, turn the heat down to the bare minimum and reduce the o2 content in the atmosphere to preserve air.

They're banging away with active sonar to find it, but this thing is deep, like 3800 feet deep from what I understand and it was heading into the grave of the titanic so it would be hard for the sonar to pick it out from the clutter.

Even if they do find it, the clock is ticking. The Titanic submarine can dive to a depth of 3800 meters or something like 13,000 feet. The deepest diving military submarine can dive to 10% of that depth.

From my understanding there are deeper diving submarines out there, but I don't think they're really built for rescue and nowhere near close.

Also if the sub hasn't managed to return to the surface, there's probably no way to get something down there to force it to the surface.

I was just reading that the last communication was an 1 3/4 into its departure.