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
Report says elders are "suffering in silence" with hearing problems because they don't want a hearing aid or think nothing can be done.
In a British led discovery astronomers have uncovered five monster black holes that were previously hidden by dust and gas.
Doctors say they believe dementia patients are being failed by health and social care services.