In Calshot, the RNLI crew are called out to a young man who has lost consciousness in a jet ski accident; when his heart stops, it’s a race against time to bring him back to life.

In Whitby, North Yorkshire, the RNLI crew race to the rescue of two fossil hunters who are cut off by the tide - and soon find that they too are in grave danger.

When reports come in of a kayaker who has failed to make it back to shore - where his wife is watching on helplessly - the Larne crew race to the rescue.

In north Wales, the Conwy crew respond to reports of two people - including a young boy - who have been caught out by the tide and are now struggling to stay afloat.

In Plymouth, the crew race to the rescue of a fisherman who’s fallen off his boat and is now adrift in the water, with a sea temperature of just eight degrees. In Llandudno - Wales’s largest seaside resort - a father and son have capsized from their kayak on its very first outing. In the ancient harbour town of Wick, in north east Scotland, a photographer is cut off by the tide on some remote rocks, with night drawing in. And just down the coast in Fraserburgh, the crew have to deploy their inflatable Y boat to rescue a fisherman whose boat has run aground on a rapidly shrinking reef.

In Torbay, Devon, a yacht has sent out a mayday, meaning the lives of the six crew on board are in grave and imminent danger. In Wales, the Aberystwyth crew race to the rescue of a small boat that has lost engine power and is drifting perilously close to the rocks at the end of the harbour wall. In Dover, the crew launch their Severn-class lifeboat, after reports that a small boat - with 30 people on board - has capsized in the English Channel. On the north east coast of England, in Cleethorpes, a man is cut off by the tide in a notorious trouble spot. And on the Sussex coast, the Eastbourne crew respond to an unusual call out: a deer in the water...

In Blackpool, the crew respond to reports of a teenager who has been swept out to sea within sight of the main beach. On the Kent coast, the Margate crew begin a frantic search to find two paddleboarders - a father and son - who have drifted two miles out to sea. In Porthcawl, a crew member’s wedding is interrupted when the pagers sound for two people cut off by the tide. And in Dunbar, on Scotland’s east coast, the crew receive reports of a dog stranded on rocks, hundreds of metres from its owner on shore.

On the north eastern tip of the Scottish mainland, the crew at Wick begin a frantic search to find a paddleboarder who has drifted a mile out to sea, while her family wait anxiously on the shore. Further south, the Fraserburgh crew respond to a mayday call from a trawler that has run aground with four fishermen on board.

In Mudeford, on the Dorset coast, the crew race to the rescue of a small inflatable boat that’s struggling to make it back to harbour in 40mph winds. On the Kent coast, a bystander has reported a capsized catamaran a mile out to sea. And in Rhyl, a Christmas Day call out to a person in the water leads to an unexpected discovery.

The North Berwick crew race out to try and save a windsurfer battling the seas as he and they fight the gale-force winds of Storm Dennis on the east coast of Scotland.

In Carrybridge, on the banks of Lough Erne, Northern Ireland, the crew face two very different challenges: a man who’s become trapped under a digger on one of the lough’s islands and a cow that’s become stuck in the mud on the shoreline.

And in Dorset, the Lymington crew race to the rescue of an elderly casualty whose yacht is caught on a lobster pot and is at risk of being overwhelmed by the stormy seas.

On the Isle of Wight, the Bembridge crew face a race against time to save an old fishing trawler that’s become trapped on a submarine barrier, and is now taking on water. Just across the island, the Cowes crew embark on a night time search for a missing jet skier.

In Anstruther, on the east coast of Scotland, a man is badly injured after falling into the harbour just a few hundred feet from the station. And on the Welsh coast, the St Davids crew work with the local coastguard team to rescue two people who are stuck on a cliff.