New series. The story of the volunteer lifeboat crews and lifeguards of the RNLI who rescue thousands of people and save hundreds of lives around our coastline and on the River Thames every year. In the first episode, a father and daughter find themselves treading water for almost an hour hundreds of metres out at sea, and three fishermen swim for their lives as their trawler is smashed onto rocks in Ireland. Elsewhere in London, an unlucky tourist is minutes from hypothermia after falling into the Thames.