Sometime after 7 a.m. Friday July 20, about 3,700 meters, or 2.3 miles under the Arctic Ocean ice cap, the robotic vehicle Puma lost a thruster on a mission to search for plumes from hydrothermal vents on the seafloor. Scientists, engineers, and the crew of the icebreaker Oden all mobilized to try to get the hobbled vehicle back to the surface, to guide Puma to a rendezvous with Oden in the shifting ice pack, and to make a hole in the densely packed ice for Puma to surface safely. Read on about our adventures on our Web site Polar Discovery.