You'd think for a few hundred dollars at the very least they could have used strong fishing line as a safety back up to understand it's movements? It should never be separated from it's mothership in case of instances like this. This is an insane situation.
For all we know the sub has just drifted away in the currents as it has a top speed of 3 knots!...that's insane not to forget all the other safety features which won't work at those depths and pressures. The red flag was using carbon fibre as a shell which isn't designed for such depths. WTF?
It has imploded and disintegrated is the only logical conclusion,
