Russian mission control center informed that the Soyuz space-shuttle boarded by Tracy Caldwell Dyson, U. S. astronaut and cosmonauts from Russia, Alexander Skvortsov and Mikhail Kornienko, undocked on Saturday from the International Space Station.

This was the second attempt, as the initial one had failed.

As informed by the mission control press service, spacecraft undocked at the right time and no troubles were faced.

On Friday, the Soyuz capsule could not undock for the foremost time in almost 10 years of flights to the International Space Station, which in turn compelled three members of the crew to be there in orbit for one more day.

Anatoly Perminov, the Russian space agency Roskosmos’ Chief while explaining said that after the crew tried undocking the computers showed a red flag. It signaled that the airlock was not completely sealed.

Fyodor Yurchikhin, Russian cosmonaut and Doug Wheelock and Shannon Walker, two NASA astronauts will still have to be in the space station.

The instance on Friday was the third docking trouble at the station in four month.

In June, the automatic system failed on two unidentified Russian Progress supply shuttles.