BBC One Wales have released a short preview video for Helicopter Rescue, the documentary featuring Prince William and the Search and Rescue team at the prince's base at RAF Valley on Anglesey.
The Duke of Cambridge is shown piloting a helicopter on a rescue mission to a slate quarry in Blaenau Ffestiniog.
One of his crew are winched from the ground after rescuing a boy who had fallen off an old railway bridge onto rocks.
"As captain you're trying to play out the entire rescue, the transit to the rescue and back again in your mind, and pick up any circumstances or problems you can foresee, and try and fix them on the ground before you get airborne," he says in the programme.
More top news
A company in the US says it has developed a hoverboard that you can ride while floating an inch above the ground.
The term 'photobomb' has been named the Word of the Year 2014 by lexicographers at Collins English Dictionary.
A Swiss supermarket has apologised for its "unforgivable blunder" after selling coffee cream with pictures of Hitler and Mussolini on.