Algodoo

So if you haven't seen my first scene about this I'll give you a quick overview.

The black box is only holding the water, not the white box.
The white box only collides with water.
The white box is connected to the anvil via springs.
Thus, the anvil is only being held up by water.
Neat eh?

This test has the anvil at 1000kg, but the rig can hold alot more!