From "Mostly Harmless" by Douglas Adams

Click, hum.

            The huge grey Grebulon reconnaissance ship moved silently through the black void. It was traveling at fabulous, breathtaking speed, yet appeared against the glimmering background of a billion distant stars to be moving not at all. It was just one dark speck frozen against an infinite granularity of brilliant night.

            On board the ship, everything was as it had been for millennia, deeply dark and silent.

            Click, hum.

            At least, almost everything.

            Click, click, hum.

            Click, hum, click, hum, click, hum.

            Click, hum, click, hum, click, hum.


            A low-lever supervising program woke up a slightly higher-level supervising program deep in the shipís semisomnolent cyberbrain and reported to it that whenever it went click all it got was a hum.

The higher-level supervising program asked it what it was supposed to get, and the low-level supervising program said that it couldnít remember what it was meant to get, exactly, but thought it was probably more of a sort of distant satisfied sigh, wasnít it? It didnít know what this hum was. Click, hum, click, hum. That was all it was getting.

The higher-level supervising program considered this and didnít like it. It asked the low-level supervising program what exactly it was supervising and the low-level supervising program said it couldnít remember that either, just that it was something that was meant to go lick, sigh every ten years or so, which usually happened without fail It had tried to consult its error look-up table but couldnít find it, which was why it had alerted the higher-level supervising program of the program.

The higher-level supervising program went to consult one of its own look-up tables to find out what the low-level supervising program was meant to be supervising.

It couldnít find the look-up table.


It looked again. All it for was an error message. It tried to look up the error message in its error message look-up table and couldnít find that either. It allowed a couple of nano-seconds to go by while it went through all this again. Then it woke up its sector function supervisor.

The sector function supervisor hit immediate problems. It called its supervising agent, which hit problems too. Within a few millionths of a second virtual circuits that had lain dormant, some for years, some for centuries, were flaring into life throughout the ship. Something, somewhere, had gone terribly wrong, but none of the supervising programs could tell what it was. At every level, vital instructions were missing, and the instructions about what to do in the event of discovering that vital instructions were missing, were also missing.

Small modules of software-agents-surged through the logical pathways, grouping, consulting, regrouping. They quickly established that the shipís memory, all the way back to its central mission module, was in tatters. No amount of interrogation could determine what it was that had happened. Even the central mission module itself seemed to be damaged.

This made the whole problem very simple to deal with, in fact. Replace the central mission module. There was another one, a backup, an exact supplicate of the original. It had to be physically replaced because, for safety reasons, there was no link whatsoever between the original and its backup. Once the central mission module was replaced it could itself supervise the reconstruction of the rest of the system in every detail, and all would be well.

Robots were instructed to bring the backup central mission module from the shielded strong room, where they guarded it, to the shipís logic chamber for installation.

This involved the lengthy exchange of emergency codes and protocols as the robots interrogated the agents as to the authenticity of the instructions. At last the robots were satisfied that all procedures were correct. They unpacked the backup central mission module from its storage housing, carried it out of the storage chamber, fell out of the ship and went spinning off into the void.

This provided the first major clue as to what it was that was wrong.

Further investigation quickly established what it was that had happened. A meteorite had knocked a large hole in the ship. This ship had not previously detected this because the meteorite had neatly knocked out that part of the shipís processing equipment which was supposed to detect if the ship had been hit by a meteorite.

The first thing to do was to try to seal up the hole. This turned out to be impossible, because the shipís sensors couldnít see that there was a hole, and the supervisors, which should have said that the sensors werenít working properly, werenít working properly and kept saying that the sensors were fine. The ship could only deduce the existence of the hole from the fact that the robots had clearly fallen out of it, taking its spare brain-which would have enabled it to see the hole-with them.

The ship tried to think intelligently about this, failed and then blanked out completely for a bit. It didnít realize it had blanked out, of course, because it had blanked out. It was merely surprised to see the stars jump. After the third time the stars jumped, the ship finally realized that it must be blanking out, and that it was time to take some serious decisions.

It relaxed.

Then it realized it hadnít actually taken the serious decisions yet and panicked. It blanked out again for a bit. When it awoke again it sealed all the bulkheads around it where it knew the unseen hole must be.

It clearly hadnít got to its destination yet, it thought, fitfully, but since it no longer had the faintest idea where its destination was or how to reach it, there seemed to be little point in continuing. It consulted what tiny scraps of instructions it could reconstruct form the tatters of its central mission module.

ďYou !!!!! !!!!! !!!!! year mission is to !!!!! !!!!! !!!!!, !!!!!, !!!!! !!!!! !!!!! !!!!!, land !!!!! !!!!! !!!!! a safe distance !!!!! !!!!! monitor it. !!!!! !!!!! !!!!!...Ē

All the rest was complete garbage.

Before it blanked out for good, the ship would have to pass on those instructions, such as they were, to its more primitive subsidiary systems.

It must also revive all of its crew.

There was another problem. While the crew was in hibernation, the minds of all its members, their memories, their identities and their understanding of what they had come to, had all been transferred into the shipís central mission module for safe keeping. The crew would not have the faintest idea of who they were or what they were doing there. Oh well.

Just before it blanked out for the final time, the ship realized that its engines were beginning to give out too.

The ship and its revived and confused crew coasted on under the control of its subsidiary automatic systems, which simply looked to land wherever they could find to land and monitor whatever they could find to monitor.

As far as finding something to land on was concerned, they didnít do very well. The planet they found was desolately cold and lonely, so achingly far from the sun that should warm it, that it took all of the Envir-O-Form machinery and Life-Support-O-Systems they carried with them to render it-or at least parts of it-habitable. There were better planets nearer in, but the shipís Strateej-O-Mat was obviously locked into Lurk mode and chose the mist distant and unobtrusive planet, and furthermore, would not be gainsaid by anybody other than the shipís Chief Strategic Officer. Since everybody on the ship had lost their minds, no one know who the Chief Strategic Officer was or, even if he could have been identified, how he was suppose to go about gainsaying the shipís Strateej-O-Mat.

As far as finding something to monitor was concerned, though, they hit solid gold.