I was at the Aquatic center yesterday and I did a gainor flip off the 3m springboard (the high dive) and slightly over rotated, landing in a seated position, since I bounced off the board a gained a height of 1m for a total of a 4m drop slapping my balls direcly onto the surface of the water, I nearly passed out, but managed to crawl out of the pool and carefuly sit down waiting 20 mins for the pain to go away.