Other robots, including HELLO , meanwhile busied themselves carving a hole in the ice "down" toward the buried docking port. Vyacheslav exited through New Caird ’s airlock, clambered down a stack of robots to the surface, and then made his way toward the site. Since the gravity of Ymir was negligible, Vyacheslav’s "weight" here was about half a gram, and the faintest contact with the surface would send him rebounding off into space. So instead of walking he had to rely on some sort of anchor fixed into the ice. Dinah was able to send two of New Caird ’s Grabbs scuttling along ahead of him. These had been engineered for movement on ice, and could rapidly anchor themselves by melting and refreezing it with their footpads. All Slava had to do was follow them and hold on to them. Once he had reached the mouth of the hole he was able to embed anchors and carabiner himself into place. Then he speeded up the work of the robots by scooping out more ice, more quickly, than they were capable of moving with their little claws.