> The support vessel relies on acoustic pings to track the submersible. If the submersible stops responding, or is out of detection range, you'd have no idea wh

> The support vessel relies on acoustic pings to track the submersible. If the submersible stops responding, or is out of detection range, you'd have no idea where it is. Sure, but you'd know the last location, wouldn't you? Especially if it's pinging at least once a minute? And if the craft failed, surely they would just set down on the floor nearby, not travel miles in a random direction sideway.