The propulsion system of Japan's "Hope" spacecraft bizarrely activated, and the International Space Station suddenly shifted its position.
The engineers at the Houston ground control center were busy at their computers, pulling up a three-dimensional structural diagram of the Space Station. They planned to use the remote control system to shut down the propulsion system, but no matter what they did, they couldn't shut it off. They had no choice but to start another propulsion system to counteract the first one, thereby maintaining mechanical balance, and preventing the Station from tilting excessively.
The old International Space Station couldn't handle the upheaval. This small mishap could trigger countless chain reactions. In regular times, it might be patched up and kept running, but the situation was different now. A high-risk surgery had to be completed.