While the endlessness of this task provides some job security, I wonder if there's any satisfaction in clearing trash that continues to collect day after day.

Daniel Aguilar/Reuters
Diver Julio Cesar Cu enters an underground tunnel in Mexico City's Iztacalco district December 5, 2006. Paid just $400 a month to de-clog the miles of sewage tunnels running beneath the Mexican capital, Cu's job is to prevent blockages in tunnels of up to 20-feet wide that could cause sewage to flood onto city streets.