Off the packed beach at Blackpool, the crew race after a teenage girl being swept out to sea on an inflatable dinghy. While on the miles of long sandy beaches at Rhyl in north Wales, amongst the holidaying crowds two girls get caught in a deadly current while swimming just a few metres from shore. And on the Cornish coast a woman, trying out the extreme sport of coasteering for the very first time, falls several metres down a cliff face onto a beach with a fast incoming tide.