Diving (sport)
Impact with water

Water resistance increases with the speed of entry, so entering the water at high-velocity induces rapid deceleration. Jumping into water from a height of 20 feet (6.1 m) results in a person impacting with the water surface at 25 mph (40 km/h). Impacting with the water surface at this velocity is capable of giving a person temporary paralysis of the diaphragm, a compressed spine, broken bones, or concussion.

The speed that a diver is travelling at the water surface when they dive from a ten metre platform is around 35mph and when a diver hits the water flat from 10 metres they are brought to rest in about 30 cm (1 ft). The extreme deceleration when hitting the water flat at around 35mph can cause severe bruising both internal and external, strains to connective tissue securing the organs, possible minor hemorrhaging to lungs and other tissues possibly resulting in a person coughing up blood, a compressed spine, broken bones, or concussion. This is very painful and distressing, but not life-threatening.

Tom Daley has described one concussion that occurred to him "I missed my hands before the Beijing World Series and smashed my head at 35mph on to the water...". The concussion resulted in him receiving "headaches, nausea, dizziness...". It also resulted in Daley being "...out of action for six days and left him unable to dive off his competition height of 10m for three weeks."

It was commented that in 1989 a 22-year-old, who was a "...diver and a member of the Salt Lake Country Club diving team......climbed up on a set of towering rocks......about 60 feet..." (18.2 metres). He dove into the water doing a "back flip." He never surfaced from the water and was found several days later 120 feet below the surface. The 22-year-old was found to have suffered a broken neck.
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