Originally Posted by
Herod
what happens when the sub has to crash-dive [snip]
Assuming he survives, the poor chap is floating about in a big ocean. If the sub survives, it only has a very vague idea where it jettisoned the machine, and anyone with SAR experience will know that the chances of seeing someone in the water, from a conning tower a few feet above sea-level, are effectively nil.
but once they surfaced, and needed to look for the pilot, they could always launch the gyrocopter
...oh wait