http://s54.radikal.ru/i146/1005/37/2766f125873e.jpg
Amelin writes at 1,100m away off from the runway the difference btw 2 maps is 20 meters, and at 1,300m away off from the runway the difference is already nearly 40 metres.
About the height from the sea level of the runway itself both sources (MAK and shuttle) though agree. At least, something.
So, how deep is the hole in its deepest point is a mystery.