Real life version of Gravity? Battle to fix International Space Station problem The new trailer for 'Gravity', starring George Clooney and Sandra Bullock. Actors Sandra Bullock and George Clooney in a scene from the blockbuster film Gravity. IF it weren't real, you'd think it was straight out of the film Gravity. A potential crisis situation is unfolding on the International Space Station - with Russia the only hope in the event of catastrophe. The problem: A fault in a flow valve that controls the temperature of the equipment on the station. At risk: Station Commander cosmonaut Oleg Kotov, Americans Rick Mastracchio and Michael Hopkins, Russians Mikhail Tyurin and Sergey Ryazanaskiy, and Japanese astronaut Koichi Wakata. A software repair would be the easiest option. A space walk the most complicated. But NASA has not yet decided on that. As the blockbuster film Gravity so effectively portrays a space walk can turn into disaster. In the film, medical engineer Dr Ryan Stone (Sandra Bullock) and veteran astronaut Matt Kowalsky (George Clooney) spiral out into the abyss of space when disaster strikes during a space walk to repair the Hubble Space Telescope. NASA said it is investigating the situation on the ISS but stressed it posed no immediate danger to the crew, thanks to a backup system. Lost in space ... A scene from the film Gravity. The astronauts on board are "in good shape," and comfortable after the cooling system problem, said mission team manager Kenny Todd. Others have been re-routed to the working cooling system. MORE: ISS problem causes emergency shutdown The final frontier ... A NASA TV image of astronaut Michael Foreman. NASA ground teams are scrambling to stabilise the systems on board. If they had to, NASA astronaut Mike Massimo says the crew are in great shape for a stroll in space. Mike Hopkins is a rookie astronaut but a great spacewalker. I've been in a pool with him ... where we practice our spacewalks," Massimo told Fox News. Should an emergency occur the crew would need to rely on Russia's Soyuz spacecraft to return home. "If there were an emergency on the space station, the crew could use the Soyuz to leave the space station and return to Earth," according to NASA. Ready for action ... US astronaut Michael Hopkins. Russia helps the United States run the International Space Station ... but only Russian spacecraft carry people to it right now. There are two Soyuz spacecraft attached to the space station for an evacuation. Each (spacecraft) carries three people to and from the space station. There is always one Soyuz for every three crew members at the space station, and there are always enough seats to ensure that everyone aboard the station has a way home," NASA communications officer Joshua Buck told Fox News. The launch window extends to the 21st, mission team manager Kenny Todd said.