robotic arm, Nicholas Patrick inspected the leading edge of the wings and the nose cap. The process, which took five and a half hours, suffered a minor glitch that required Patrick to order the arm to manually grab the boom. During this time, the crew also inspected the upper surface of the orbiter. Astronauts also completed a check of the spacesuits to be used during the mission, along with preparation for docking with the International Space Station. December 11 (Flight day 3 – Docking to ISS) Flight day 3 began for the astronauts at 15:18 UTC. Following the rendezvous pitch maneuver, docking to the International Space Station occurred at 22:12 UTC. The hatch between the International Space Station and Discovery was opened at 23:54 UTC. The joint ISS/Shuttle crew then worked to undertake some further detailed inspection of the orbiter and unloaded the P5 truss segment from the payload bay, handing it off successfully from the shuttle robotic arm to the station arm. The astronauts scheduled for Day 4's EVA, Robert Curbeam and Christer Fuglesang, ended their day by entering the airlock for a "campout" sleep session to prepare for the EVA by purging their bodies of nitrogen in a lower-pressure environment. Such a practice is common in order for the astronauts to avoid getting decompression sickness. December 12 (Flight day 4 – EVA #1) Flight day 4 began for the astronauts at 15:47 UTC. During the first EVA of the mission, the astronauts of STS-116 brought the ISS one step closer to completion with the addition of the P5 truss segment. The EVA began at 20:31 UTC, with Curbeam and Fuglesang removing launch restraints from the P5 truss and Mission Specialist Joan Higginbotham making use of the station's robotic arm (the Canadarm2) to move the truss segment to within inches of its new position on the P4 truss. The spacewalkers then guided Higginbotham with visual cues as the precise operation to finalize the attachment of the truss was completed. After the P5's attachment, Curbeam and Fuglesang finalized the installation with power, data and heater cable connections. They also replaced a faulty video camera attached to the S1 truss. Since they worked ahead of the time-line, the two astronauts were also able to complete some get-ahead tasks. At the end of the spacewalk, Curbeam congratulated the Nobel Prize winners, including scientist Dr. John C. Mather at NASA's Goddard Space Flight