Now please think, in your expert opinion, when you feel your aircraft will no longer be controllable/survivable above such limits.
what a question... NO real pilot will intentionally go significant beyond barber pole to test at which speed he looses control and the aircraft seperates. the pilots who saw the real limit will not tell you...
you can go and ask a submariner at which real depth from his experience the boat has been crushed due to waterpressure...