Most of the cash stolen in the Great Train Robbery of 1963 was never recovered. And the perpetrators were a rather sordid bunch.
https://www.standard.co.uk/news/crime/the-great-train-robbery-of-1963-who-was-in-the-gang-with-ronnie-biggs-and-how-much-was-stolen-a3901601.html
...
Outstanding book by Michael Crichton and they pretty much did get away with it.
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