SAS deaths: Veteran on the drive to succeed at any cost

The deaths of three SAS candidates during a selection march in the Brecon Beacons caused widespread shock.

A month-long inquest into why the extremely fit, experienced soldiers collapsed and died, is due to deliver its verdict on Tuesday.

BBC Wales news website went to the Brecon Beacons with SAS veteran Rusty Firmin to find out what drives soldiers to the limits of endurance and beyond.

He gives us a fascinating insight into how men can die of heat exhaustion in a part of the UK more associated with the cold and wet.