Excavation is a weapon obtained by prestiging for the 5th time in the game.

When activated your tank shoots out 12 or so large diggers in a sort of fashion like River or Creek, when they land on the terrain they begin pounding down holes into the ground just like regular diggers, but unlike conventional diggers the excavation diggers do not remain fixed and dig down on the same area, instead they bounce around and change positions with each other to spread out more.