A team of astronauts had to abandon their space walk after water leaked into one of their suits.
Two of the crew on the International Space Station were doing routine maintenance work on the vessel, when one of them noticed water floating around inside his helmet.
Luca Parmitano thought it was sweat at first, but then quickly realised it was more serious.
He couldn't hear or speak and had to get help to get back into the space station.
Nasa isn't sure why his helmet leaked, but they think it could be from the drink bag astronauts sip from during spacewalks.