This is the moment a 16-year-old boy hits a gravestone over 30 feet into the lagoon and breaks his spine.
Lindsey Wilson filmed his son Sam jumping off the edge of a former quarry last week during a trip to Aberaidi, Pembrokeshire.
West He is from Bradford, Yorkshire, and this teenager of his had previously made successful jumps without problems, so he saw no problems on his second attempt.
However, after slamming into the water in a "slightly seated position", Sam "turned pale" as he came back to the surface of the lagoon.
His mother was later told that the force of impact was similar to landing on concrete.
Luckily Sam was able to cling to some rocks at the edge of the quarry and many other swimmers came to his aid.
Lindsay told WalesOnline: "Sam is 16 and a great swimmer, so at first I thought nothing was going on.
29} "There were other people in the lagoon at the same time, and he thought they were just waiting for them to come out first. But then I saw him turning pale and clinging to a rock. 'Lindsay, 41, said a woman named Tessa, a member of the outdoor adventure group Celtic Quest Coasteering, went the extra mile to help her son..
The stranger put Sam on his back and used a paddleboard as a makeshift stretcher before some of her party swam him to shore. I am so grateful to them, I can't imagine what would have happened otherwise," Lindsay added.
Sam was airlifted by ambulance and taken to a hospital in Carmarthen for a CT scan. Doctors discover that the teenager has suffered a spinal fracture and needs a brace.
"When he was first examined, he must have been still in shock because he told the doctors he could not feel the pain in his back. Very thoroughly, it's a good job he claimed to have a .scan," Lindsey added.
NHS officials say she and Sam's father sleep on the floor of their bedroom at night in case they need anything or wake up in "extreme pain." That's it.
Lindsay wants to warn those contemplating scrapping about the risks they are taking in the hope that "no one else has to go through what we have gone through."
"But given that children were still jumping off the ledge into the water after Sam's accident, I fear the warning may go unheard."
Jumping into the water from a height in a vertical position.
Many have been injured by people slamming into hidden rocks or by misjudging how shallow water is due to changes in water depth caused by tides.
A National Water Safety spokesperson said:
``Sadly, many people have died or been seriously injured. Our message is simple: don't jump into the unknown.'
Contact the news team by emailing webnews@metro co.uk.
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