An acquaintance of my father's was one Tony Svenson, a British exchange pilot who had the honor of crashing the first Mirage at Laverton(?) when I was about thirteen.
As far as I can recall, he had an engine failure and dived to try and restart it, and with no luck, he ejected when believed to have been Supersonic.
Both leg restraints broke free, two broken legs, two broken arms. I saw him in Hospital about a month later and he was a shadow of his former self. Only his superb fitness kept him alive.