Diver William Walker saved Winchester Cathedral:
From 1906, Walker laboured under water below the Cathedral for six hours a day at depths up to 6 metres (20 ft). He worked in total darkness, using his bare hands to feel his way through the cloudy, muddy water.
His huge, heavy diving suit took a long time to put on. So when he stopped for lunch, he’d just take off his helmet. He also sometimes smoked his pipe, which he thought would kill off any germs.
(via the aforementioned Geoff Manaugh)