Media playback is unsupported on your device

Kent police patrol Channel Tunnel

28 June 2013 Last updated at 16:47 BST

Officers from Kent Police have shown the BBC the work they do patrolling the Channel Tunnel.

Using specially designed narrow vehicles, police work more than 40m (131ft) beneath the Channel.

BBC South East's Jon Hunt spoke to Sgt Andy Brittenden, and Insp William Silcock.

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.