The pair were rescued by a passing boat and were given emergency CPR by the boat owner and a member of Watchet Coastguard before being taken to hospital by ambulance.
The incident has prompted a warning from West Somerset Council’s assistant harbour master Craig Butler who said: “It’s so sad that this incident happened at the end of a fantastic summer in Watchet.
“The harbour is an extremely dangerous place to swim or to jump into the water from the harbour walls. The Bristol Channel has strong currents, extreme tidal ranges and there’s also danger from marine traffic.
“We work with HM Coastguard, Police and the Sea Scouts to spread the message in schools and to highlight the risks.
“I take health and safety extremely seriously for harbour users and the public that frequent the harbour all year round. As harbour master I wish both young men a full recovery and really hope they and others will learn from this very serious incident.”
Cllr Martin Dewdney, West Somerset Council’s Cabinet member for Resources, said: “It is extremely dangerous to jump into the water at any harbour as there are numerous hazards. There is sensible advice on our Beach Safety
page on our website: so I would urge people to enjoy our coastal areas – but to do so safely.
“Water depth changes with the tide, the water may be shallower than it seems and submerged objects may not be visible, the shock of cold water may make it difficult to swim and strong currents can rapidly sweep people away.”
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