A woman was airlifted to hospital following a rescue operation at Burnham Overy harbour.
She was taking part in an 'outdoor activity' event near the staithe when she fell ill.
A lifeboat crew from nearby Wells-next-the-Sea were sent to the scene, following a call at about 3.50pm on Saturday, June 10.
Local coastguard teams, including a rescue helicopter, were also sent to the area.
Low tides meant the lifeboat could not reach the casualty, so a member of the crew went ahead on foot to help treat her.
The helicopter then arrived and took her to hospital in Boston, Lincolnshire.
Her condition is not known.
A spokeswoman for Wells RNLI said: "The Wells inshore lifeboat was called at 3.50pm to give assistance to a casualty who had got into health difficulties.
"They collapsed whilst participating in an outdoor activity event near Gun Hill and Burnham Overy harbour."
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The lifeboat arrived at 4.22pm, at which point a crew member went ashore and helped provide medical assistance.
The coastguard helicopter arrived fifteen minutes later.
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