Residents and visitors across Cornwall are being urged to think twice before jumping into the sea off cliffs and harbour walls.

Safer Cornwall is reminding people of the dangers of tombstoning, which has claimed lives and resulted in people suffering serious injuries.

Councillor Carol Mould, portfolio holder for Neighbourhoods at Cornwall Council, said: "In recent years tombstoning has gained lots of attention for the wrong reasons, with a number of people being seriously hurt.

"We are asking anyone who jumps into the water to put their safety first.

"I’d also ask that parents keep track of their children’s activities and remind them of the dangers of tombstoning."

A spokesperson for the RNLI said: "We strongly urge people not to tombstone.

"It is incredibly dangerous as the water depth is unknown and may be shallower than it seems; submerged rocks and objects may not be visible; and strong currents can sweep people away quickly. "The water temperature can also cause cold water shock which makes it difficult to swim.

"Jumping from height into the water can and has caused serious injury and death."

HM Coastguard similarly advises against taking part in tombstoning activities as they remind everyone to stay safe and avoid dangers while at the seaside or coast.

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A spokesperson for HM Coastguard said: "We always urge people to have fun but stay safe when out enjoying our beautiful beaches and coastlines.

"Jumping from piers, cliffs, rocks or other structures into the sea can be very dangerous.

"The depth of the water can dramatically change with the tide, and what was a deep pool at lunchtime might be a shallow puddle by teatime.

"You don’t know what hazards may be lurking under the surface until you are hurt or worse.

"If you do want to jump from height into the sea we would advise people to join a coasteering group with a professional and reputable adventure centre.

"As ever, our message is, ‘Keep safe, but if you see anybody in trouble or if you get into difficulty, call 999 and ask for the Coastguard."

Thrill seekers can learn about the risks involved and have a good experience by trying coasteering - a mix of scrambling, climbing, traversing and cliff jumping around the coast with a professional guide.

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Those who are determined to take part in tombstoning, despite all the warnings, are urged to follow advice from the Royal Society for the Prevention of Accidents:

• Check for hazards in the water. Rocks or other objects may be submerged and difficult to see

• Check the depth of the water. Remember tides can rise and fall very quickly

• As a rule of thumb, a jump of ten metres requires a depth of at least five metres

• Never jump whilst under the influence of alcohol or drugs

• Check for access. It may be impossible to get out of the water

• Consider the risks to yourself and others. Conditions can change rapidly – young people could be watching and may attempt to mimic the activity.

And, if you jump when you feel unsafe or pressured, you probably won't enjoy the experience.

If you or anyone gets into difficulties around our coast, call 999 and ask for the Coastguard