Reisman completed the battery swap by removing and replacing the final two batteries and retrieving the temporarily stowed old battery on the truss. Once that task was complete, Good and Reisman moved to Atlantis's payload bay, where they removed a grapple fixture and took it to the Quest airlock. The pair then moved on to fix some insulation on the Dextre robot, and stowed some tools in an external toolbox on the Z1 truss. Pilot Tony Antonelli choreographed the spacewalk from inside the shuttle. While the spacewalk was going on, Commander Ken Ham and Mission Specialist Steve Bowen completed some more of the transfer work for the mission. May 22 (Flight day 9 – ICC-VLD re-installation and off-duty) Flight day 9 saw the shuttle crew enjoying some off-duty time during the afternoon. In the morning, the entire crew participated in some transfer activities and orbiter maintenance. The ICC-VLD was also berthed back aboard Atlantis' payload bay, having completed its tasks for this mission. The Canadarm2 was used to return the ICC-VLD to the bay, and was operated by Mission Specialists Piers Sellers and Garrett Reisman and space station flight engineer Tracy Caldwell Dyson. The ICC-VLD re-installation operation began just after 4:30 am EDT, and was completed at 5:50 am EDT. The shuttle crew and Caldwell Dyson also answered some questions from elementary- and middle-school students from around the U.S. Students from 12 NASA Explorer Schools had submitted their questions earlier by video. The combined shuttle-station crew also shared a joint meal before the shuttle crew enjoyed two and a half hours of off-duty time starting at 11:05 am EDT. May 23 (Flight day 10 – Undocking) On flight day 10, the joint STS-132/Expedition 23 crews awoke to begin the final hours of the joint docked mission. The crews completed the final time-sensitive transfers of the mission, which included scientific research samples that need to be kept cold. Once these transfers were completed, the two crews held a joint crew news conference and took a crew photo, and later, prior to hatch closure, held a mutual farewell ceremony. After the ceremony, the hatches between Atlantis and the International Space Station were closed, and a leak check was performed to ensure all the hatches were sealed properly. The shuttle undocked from the ISS at 15:22 UTC, a little more than 2 hours after the hatches were closed. At the time of the