Not directly relevant but as far as rapid descents and dives are survivable and the likely results of such... here is a copy of a post elsewhere on this board...
Saha Air 707 loses 2 on climbout
N712PA a JT3 engined 707 from Pan Am's initial 6 lost the No 4 engine over France on 25th February 1959 in a training incident, it landed at Heathrow and was repaired in the Pan Am hangar.
N712PA had been involved in a near 30,000 ft dive over the Atlantic three weeks earlier where it got close to Mach 1 ...possible autopilot malfunction ..... No 3 does'nt look to clever either!! ..... nobody checked the engine mounts?.
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