Media playback is unsupported on your device

Mexico City's only sewer diver

9 September 2013 Last updated at 21:59 BST

Julio Cesar Cu is the only sewer diver in Mexico City, whose 20 million inhabitants produce twelve thousand tonnes of waste a day.

He keeps the sewerage system clear of blockages, by diving into the murky depths.

Valeria Perasso reports

Most watched

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.