The pond project

Friends of mine allready 3years studiyng on making a big pond in the garden. Finally they started yesterday. The sister of my friend, here in the pic and i are supporting for the weekend.The pit here pictured is were the water will be gathered and pumped into the pool.We had to install 3 kinds of maths which was not an easy task. Finally after installing a layer of 4 pallets high had to be installed and on it 3 layers of stones. The stones will function as filters.Everything was well prepared , but it all took lots of time. i went late home and will come back next day.