In this new series on BBC1, Ellie Harrison and Adam Henson explore hidden parts of the UK, hunting for secrets in the countryside.
In this first episode, Ellie and Adam visit South Wales to explore the unseen water world and caves in the heart of the Brecon Beacons.
One stunning morning Clive took Adam & Ellie flying along with a poet to get an awe inpspiring aerial view of the Brecon Beacons!
First Broadcast 8th April 205 Water World of Wales BBC1
Secret Britain, Series 2 Episode 1 of 3