Rescuers are cutting through a rock to save a man who is trapped while the tide comes in with the water up to his neck, the Coastguard has said.
The man trapped his leg under rocks near the East Promenade, Sheringham, Norfolk.
Emergency responders are holding his head above the water, and he has been giving a lifejacket and breathing apparatus.
A 999 call came in just after 5.30pm and rescue efforts co-ordinated by Cromer and Sheringham coastguard and Sheringham RNLI are under way.
Norfolk Police, Norfolk Fire and Rescue and the East of England Ambulance Service are also at the scene.
The public has been urged to avoid the area while rescue efforts continue.
Norfolk Fire and Rescue Service said: “We are currently dealing with a protracted incident on East Promenade in Sheringham with our partner agencies.
“Please avoid the area to allow our crews to work.”
Sheringham RNLI said they were called to launch a lifeboat at 5.41pm, writing on Twitter: “SHOUT! LAUNCH ALERT Sheringham Lifeboat has been requested to launch on service.”
Zach Pedley, from HM Coastguard, said: “This is a very frightening experience for this man.
“Thankfully someone knew to call 999 and ask for the Coastguard which meant we could send the right response immediately. Everyone is working together at the scene to keep him calm and safe.”
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