"Below ground, in the cramped but growing network of tunnels beneath London's streets, the sewer-hunters slogged through the flowing waste of the metropolis. Every few months, an unusually dense pocket of methane gas would be ignited by one of their kerosene lamps and the hapless soul would be incinerated twenty feet below ground, in a river of raw sewage."
—Steven Johnson, The Ghost Map (New York: Penguin, 2006), 2
Sionnach, if you didn't already have this listed, it could go on your Trades list. What young person wouldn't aspire to this challenging career?