Looking down the front of the dam. There were no people down there to give an idea of scale when the pic was taken but you can see two doorways with steps leading down to the platform. Looking over the edge is scary. This is approximately the depth of the water which has been dammed up on the other side. It is the pressure of the water which turns the turbines which run the generators which make the electricity which lights the light that's inside the fridge that sits in the house that Jack built, whoever he was.