What is lowest know parachute opening where the diver Walked away unharmed?

I want to know how low, still jumping from a high height (NOT A BASE JUMP) someone has been able to pull the parachute without being injured. because when i watch a video i see them open there chute and they some falling fast very soon and they slowly come all the way down. why don't they open much later till they are just able to open there parachute and half a second later land, it would be scary as hell but i would do it if i had some training, I'm only 14.