[mek6800d2]

The Galileo hack was indeed incredible. From a post-mission paper:

"Although the primary mission was completed in December 1997, the mission was extended three times to take advantage of the spacecraft's durability with 24 more orbits. The extensions enabled additional encounters with all four of Jupiter's major moons: Io, Europa, Ganymede and Callisto. Galileo flew near a small inner moon, Amalthea, before making a planned mission ending plunge into Jupiter's atmosphere. In total, Galileo had 35 encounters of Jupiter's major moons -- 11 with Europa, 8 with Callisto, 8 with Ganymede, 7 with Io and 1 with Amalthea -- and returned more than 30 Gigabytes of data, including 14,000 images."

The paper is a very readable description of the problem, solution, and end results:

P.A. Jansma, "Open! Open! Open! Galileo High Gain Antenna Anomaly Workarounds" 2011, abstract: https://doi.org/10.1109/AERO.2011.5747657 (The full paper can be found online with some effort.)