We've recently moved into a house which has a 10x6ft sunk pond in the ground which we want rid of. I've pumped pretty much all of the water out and tried stabbing the bottom of the shell to drain the rest of the water into the ground but it's solid - could be concrete lined but the lining is pretty solid anyway. Sledgehammer? Drill through the bottom? The plan is to then lift the moulded shell out and saw it up and take it to the dump - it's pretty manky so I can't imagine anybody would want it. Then use all the rubble and extra hardcore to fill in the hole, add a bit of topsoil and create an area of turf. Any tips guys?