Early on November 15 astronauts aboard the International Space Station received an unexpected directive: Seek shelter in your docked spacecraft in case of a catastrophic collision. The station was about to pass through a freshly created cloud of orbital debris that posed a significant risk to the seven space travelers on board.

Four NASA astronauts, who had arrived just last week retreated, to their SpaceX Dragon capsule, while Russia’s two cosmonauts and another NASA astronaut took cover in their Soyuz spacecraft. They stayed inside these orbital lifeboats for about two hours, then repeated the exercise roughly 90 minutes later, as the station again passed through the new debris cloud. NASA has since canceled a handful of planned activities, warning that the