NASA managed to fix Voyager One remotely, sending the interstellar spacecraft updated computer code to route around a hardware failure via a radio transmission that took 22.5 hours to arrive. Imagine rebooting a server over ssh, but the server is more than fifteen billion miles away and you don’t have a tech on-site in case something goes wrong. This team is a first-ballot shoo-in for the Ops Hall of Fame.

(I stole this write-up, but the achievement is admirable.)
https://blogs.nasa.gov/voyager/2024/04/22/nasas-voyager-1-resumes-sending-engineering-updates-to-earth/