Houston: Indian American astronaut SunitaWilliams and USspacewalking record-holder Michael Lopez-Alegria have wound up a six-hour,40-minute spacewalk, the last in an unprecedented series of three spacewalks innine days from the quest airlock.

While, astronaut Michael Lopez-Alegria broke the US record of most time walkingin space, he needs more than 24 hours to beat the all-time record (82 hours) ofRussian Anatoly Solovyov.

The spacewalk ended at 2:06 pm CST yesterday (01:36 IST today).

Sunita, in her all white space suit and lopez-alegria dooning red striped suit,accomplished all their primary tasks of maintenance work outside theinternational space station, successfully.

The major tasks scheduled for yesterday's spacewalk included: the removal anddisposal of several unneeded thermal shrouds, the deployment of an ISS cargocarrier attachment point, loosing several launch locks on the station'sportside truss, and the successful installation of a set of cables to transferpower from the ISS to visiting space shuttles.

In addition to the mentioned tasks they were also able to perform an extraphoto survey of the station's shuttle docking port, known as the PressurizedMating Adapter-2.

It was the last in an unprecedented series of three spacewalks in nine daysfrom the quest airlock.

The three spacewalks, termed EVAs 6, 7, and 8 because there were five previousstation spacewalks from the USairlock quest during increments, times when no shuttle was present, beganyestersday, at 7:27 CST (18:57 IST).