RNLI: "Tombstoning is a dangerous practice"

Stuart Thompson, from the RNLI, says one of the risks of tombstoning is the sheer unpredictability of the environment.

"The problem is that you know heights of tides change, conditions change" he says.

"The conditions of the seabed change as well so it's actually quite a dangerous practice".

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'Tombstoning' risks lives

The RNLI are warning people that they are taking their own lives into their hands by taking part in so called 'tombstoning.' A number of people have posted videos on the internet showing people diving off cliffs around Wales.