Yesterday it was the Sawstop, today it's the Sawfish, a remote-controlled robotic submarine from Triton Logging that comes with a chainsaw for cutting down underwater trees. We hadn't even realized that there were trees underwater that needed cutting down, but apparently there are some 200 million trees worldwide that are at the bottom of lakes and reservoirs that were created by the building of hydroelectric dams. If the water at the bottom of the lake is cold enough, the trees usually don't rot and can actually be sold as lumber.
[Via Slashdot]