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A frantic mother alerts the lifeguards after six teenagers are cut off by the tide in Watergate Bay, north Cornwall.
In Portaferry, Northern Ireland, the crew face an increasingly urgent search for two kayakers who've been blown out to sea in 50 mile an hour winds.
A kayaker has called a mayday after getting into trouble; although he's able to communicate via his VHF radio, it's a race against time to find him.