While I certainly wouldnt want to be the pilot in one of these are the dangers not a little overblown about crash diving.
If the sub doesnt have radar how is it going to crash dive without the alert from the guy in the gyro copter..
He could see a destroyer probably ten miles away whereas on t he sub its two miles away. Plenty of time to recover to the sub, perhaps not to stow the contraption, but time for the pilot to descend and report and then crash dive