How deep is the pool?<br><br>And do they create little waves to break the surface tension?,(reply>), Surface tension doesn't cause injury on impact, the force your body exerts by shoving the water out of the way is what causes injury. Water has mass and accelerating a mass requires a force. The farther you fall, the faster you ever the water, the harder your body pushes the water, the more force your body is slammed with.