Articles on sewer workers

Flushers in London sewers:
http://www.ediblegeography.com/fatbergs/

And sewer divers in Mexico City:
http://www.ediblegeography.com/julio-the-sewer-diver
http://pruned.blogspot.com/2007/01/sewer-divers.html
http://www.washingtonpost.com/wp-dyn/articles/A45322-2004Aug29.html