Enryu rescue robot in action:
"A chainsaw-wielding robotic submarine is roving beneath Lois Lake in British Columbia, Canada. It is chopping down a forest that was left submerged decades ago when the valley was flooded by a hydroelectric dam. After it cuts the trees, they are floated to the surface, where they are dried out and sold to mills for use in furniture and construction, like any other lumber.
Trees left standing in flooded forests die, but they do not rot because the water keeps out oxygen. Worldwide, some 200 million trees are thought to be standing on the floor of hydropower reservoirs."
"Robot venture Tmsuk yesterday held a press day to officially launch and demonstrate its massive tractor-with-arms rescue robot, Enryu. See Enryu rip the door off a perfectly good car! See Enryu pick up a steel girder with one hand! etc.
"The impression we get from the videos is that it's rather a sluggish beast, though it turns out this is deliberate [...] The original settings had the robot arms moving at the same pace as the operator's, resulting in a lot of dangerous high-speed flailing about that would have made it impossible to use at the scene of an accident. This is a creature that can lift half a ton with one arm, mind. The arms now track the operator's movements at a slower speed, though they do stop immediately the operator does."