Return of the Bus Plunge

[beamjockey]

As an eyewitness to the Philae lander's final moments of operation, the incomparable Emily Lakdawalla writes: From our position behind the glass, Steven, Chris and I watched the engineers as they, in turn, watched a set of graphs on their screens - graphs that were declining steadily. Shortly after the motion was commanded, the main bus voltage plunged.
The last place I expected to spot a bus-plunge story was on the surface of a comet nucleus.