Total Hull Unscheduled Descent. Emergency landing: bring any space platform down to the planet it is orbiting. Aim it where you like, and the whole platform - machines, cargo and anyone aboard - comes down onto the ground, still wired and still powered. Its hub becomes a landing pad. There is no way back up, except the usual one.
Mods introducing new content into the game.
Counted when a user downloads a mod release for the first time. Before Nov 2021 it counted everytime a user clicked the mods download button.
Counted when a user downloads a mod for the first time. Has no data before Dec 2022