Two veteran cosmonauts sailed through a six-hour spacewalk outside the International Space Station yesterday to prepare the orbital outpost for a new module and better shield its living quarters against small meteorite and debris impacts, officials said.

Stationcommander Gennady Padalka and flight engineer Yuri Malenchenko opened the hatch on thestation's airlock at 11:37 am EDT (1537 GMT) to begin aspacewalk to relocate a construction crane, install debris shields and release a small satellite into orbit.

Their departure was delayed about an hour while engineers assessed a leak between the Pirs docking module and Russian segments of thestation, a $100 billion laboratory for microgravity experiments and technology testing that flies about 250 miles (400 km) above Earth.

But the issue was resolved and the experiencedspacewalkers more than made up the lost time.

Padalka, who was making his ninthspacewalk, and Malenchenko, on his fifth, moved a hand-operated, 46-foot (14-meter) crane, called Strela-2, from the outside of Pirs to Zarya, the cornerstone of thestation. Pirs is due to be detached from thestationnext year to make room for a new Russian laboratory and docking module.

The United States completed construction of its part of the outpost last year and retired its threespaceshuttles. Europe, Japan and Canada also are partners on the project.

With the crane in place, thespacewalkers then used a hand tool to launch a 20-pound (nine-kg) spherical satellite on a path behind thespacestation.

"Nice throw," a flight director in the Russian mission control center outside Moscow said through a translator monitoring radio communications with the cosmonauts.

The satellite, which is expected to remain in orbit for about three months, is intended to serve as a target for Russian engineers working on computer models that evaluate orbital tracking.

Thespacewalkers' last major task was to install five debris shields to the outside of the Zvezda module, the crew's primary living quarters. They also retrieved a briefcase-sized experiment that has been exposing various materials to the harsh environment ofspaceand installed two support struts on a ladder.

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Spacewalkers prepare International Space Station for new Russian lab