It was originally reported as 4 ft deep- but PB reported it as about 3ft deep- either depth when you are a little over 5ft is going to be deep, hitting a lot of your core body reducing the temp quickly. There is also a rocky bottom- if you fell in toppling forward you may hit your head, but also the possibility you twist your foot between rocks or bend your knees and hit your knee. When I visualise people falling I always think of younger children and how and what they hit as they fall either forwards or backwards and where there injuries are (they fall far more than we do as adults). In water you will automatically try and save yourself, like a child, with your hands- but there will be no resistance to stop your momentum.