MOSCOW, September 21 (RIA Novosti) - Russia's Progress M-67 cargo spacecraft successfully undocked on Monday from the International Space Station (ISS), a Russian Mission Control spokesman said.

Progress M-67, the last Russian cargo spacecraft with an analogue control system, arrived at the orbital station on July 29, bringing 2.5 tons of supplies to the ISS, including fuel, water and various equipment.

"The crew had fully prepared the cargo spaceship for the automated flight. The command to undock was given, and the cargo spacecraft successfully undocked and moved away to a safe distance from the station," the spokesman said.

The craft will now be used as an orbital laboratory to conduct a series of geophysical experiments under the Plasma-Progress program before reentering the Earth's atmosphere on September 27 and plunging into a "spaceship cemetery" in the southern Pacific.

Progress-series freighters have been the backbone of the Russian space cargo fleet for decades. In addition to their main mission as cargo spacecraft, they are used to adjust the ISS orbit and conduct scientific experiments.

The new generation of Progress vehicles is digitally controlled.