NASA confirmed the problem, saying it consisted of a "minute pressure leak" and that the crew was repairing it.
Three spaceships are docked at the ISS including the Progress 70 resupply ship and the Soyuz MS-08 and MS-09 crew ships. In case of an emergency, the capsule is also a lifeboat. NASA signed an accord in 2017 to acquire extra Soyuz seats into 2019, even though no further contracts involving the Russian craft have been announced.
Three Americans, two Russians and a German are now on board the station.
The first to take charge of the situation was Gerst himself, who did what anyone in his position would do and plugged the hole with his thumb.
In September 2014, NASA awarded Boeing and Elon Musk's SpaceX a combined $6.8 billion to revive the U.S.'s capability to fly to the ISS station. Space.com reports that the epoxy formed a bubble that anxious the astronauts, but it seemed to be holding.
Russian Federation will stop sending United States astronauts to the worldwide space station in April 2019, - was announced today by the radio station "Kommersant FM 93,6".
"All station systems are stable and the crew is planning to return to its regular schedule of work on Friday". But flight controllers and the crew are trying to develop a more long-term fix.
Working with mission control in Houston, USA, and Moscow, Russia, the astronauts localised a leak that appears to be in the Russian segment.
The 2mm wide "micro fracture" in the £115 billion NASA satellite was discovered after crew noticed a drop in pressure. Kelly tweeted, adding: "We've dodged a lot of bullets over the past 20 years. There's a lot of space junk up there, a serious issue which needs to be addressed", retired NASA astronaut Scott Kelly wrote on Twitter. All's well that ends well, though, and the ISS crew has resumed normal activities.