Sending a robot into the depths is one thing. Bringing it back to the surface is another. Bringing it back to a surface that is ice-covered is one of the most challenging and nerve-wracking parts of this expedition. To ensure that the robotic vehicle Puma did not get trapped and lost beneath the ice, or damaged by hitting ice, scientists “talked” to it and told it to drive itself to a hole created in sea ice. Creating and maintaining that pool of open water wasn’t easy. But the cat came back.