No. 1 on the bottom-10 list of the worst jobs in science was this type of diver who swims in sewage & toxic waste
They refer to it as 
their "annual bottom-10 list, in which we salute the men and women to do what ... 
1: Hazmat Diver (swim in sewage, toxic waste, and other...things) [DOC] [TLE] Into the murky waters: hundreds brave New York City's East River for ... [PAR] Jul 8, 2013 ... Swimmers at the starting line in Brooklyn Bridge Park.