One thing they seems to have got working fairly reliably is the lunar landing of the probe using image processing to guide the final approach and touch down. It seems to have worked well in this and the previous mission, there are videos on youtube of that.<p><a href="https://youtu.be/wUju9-cckKA?si=nZFOCga10mnCA_vs" rel="nofollow">https://youtu.be/wUju9-cckKA?si=nZFOCga10mnCA_vs</a><p>The other component is the autonomous docking of the return probe in lunar orbit.<p>Soviets have done a lunar sample return, but they had a probe that would lift off directly into a earth return trajectory, but that seems to have limited both the liftoff mass and the possible zones in moon from which it can lift off. This seems a much more complex mission than that.<p>Also some animated videos of the misson show a skip re-entry back to earth, don't know if it is the case during this particular flight.