When Dean, from Birmingham, signed up for a kayaking expedition with his cousin, they decided to get some training practice at the coast to prepare for the conditions. But as day fell into night, they couldn't get back to shore from the sea. With empty batteries on their mobile phones, and exhaustion setting in from paddling against the impossible conditions – how would the lifeboat volunteers at Rhyl RNLI find Dean and his cousin in the dark, open water?