1940: If the Wehrmacht crossed the English Channel and German jackboots got as far as Oxford, the Australian Howard Florey and his team of researchers at the university planned to destroy their work on penicillin to prevent it benefitting the enemy.
Hoping to salvage something from their efforts, they intended to rub Penicillium notatum into the fabric of their coats, knowing that the spores of mould could survive for years. Then at some time, somewhere, they might be able to resume their work.
Source: Eric Lax, The Mould in Dr Florey’s Coat: The Remarkable True Story of the Penicillin Miracle (2004), pp. 4, 158–9