mid-January, but was delayed due to NASA's concerns about some cables on the shuttles. This mission brought the U.S. built Destiny laboratory, which has a mass of 16 short tons. It was installed with the use of the shuttle's robotic Canadarm, controlled by Marsha Ivins. Astronauts Thomas D. Jones and Robert L. Curbeam helped with the installation during a spacewalk. The Destiny module had a cost of US$1.4 billion, and would be used primarily for scientific research. During the spacewalk an ammonia coolant leak created a contamination scare, which happened when Curbeam was hooking up coolant lines to Destiny. The other two spacewalks went ahead without any problems. While the Shuttle was docked, the control of the station's orientation was switched from propellants to electrically powered gyroscopes, which had been installed in September 2000. The gyroscopes had not been used earlier due to the lack of key navigational electronics. By the end of STS-98, the crew of Expedition 1 had been on the station for over three months, and Shepherd stated that he was "ready to come home". NASA used several techniques to prevent the three crew members from suffering the effects of the "three-month wall" psychological barrier, which had caused depression in previous astronauts. For example, they allowed more time for the crew to speak to their families via videophone, and they also encouraged them to watch movies and listen to music they like. Progress M-44 On 28 February the third Progress spacecraft to visit the ISS, Progress M-44, docked to the Zvezda module. It brought air, food, rocket fuel and other equipment. It remained docked until Expedition 2, when it was intentionally burnt up during atmospheric reentry, like all Progress spacecraft. STS-102 Space Shuttle Discovery docked on 10 March 2001, bringing to the ISS the new long-duration three-person crew of Expedition 2, as well as four short-term crew members of STS-102. A few hours after docking, the hatch opened, and all ten astronauts greeted each other, setting a new record for the number of people simultaneously in the ISS. The day after docking, American astronauts Jim Voss and Susan Helms began a spacewalk which ended up being nearly nine hours long, and still holds the record for the longest spacewalk ever performed, as of August 2010. The length of the spacewalk was partially due to some mistakes, including Voss accidentally releasing a small tool. Unable to retrieve it,