In 1994, a climbing robot by the name of Dante II was sent for the first time to explore the interior of a volcanic crater in Alaska. After entry into the crater, the measuring devices and cameras, hidden in the legs of the robot, started exploring the dangerous terrain. By analyzing the data and the images received from the surroundings, an onboard computer calculated each step of the robot. It was able to overcome boulders as high as 1 m and descended 70 m deep in the volcano before crashing. Fortunately, it had sent all the data collected and the images to the research station via satellite before it crashed.
