"Use the steamshovel to dig up ground, turning it into water. You can also fill water, turning it into ground. Use the spacebar to dig and fill."
Steamshovels have the capability to move around normal and swamp terrain by "digging" and "filling". Upon digging, the hole left behind is water and all filling spots are also water. Steamshovels lose approximately one energy every time they pick up swamps. They lose energy remarkably fast, though not as quickly as Treebots do.