PCLの2章より:

An even more impressive instance of remote debugging occurred on NASA's
1998 Deep Space 1 mission. A half year after the space craft launched, a
bit of Lisp code was going to control the spacecraft for two days while
conducting a sequence of experiments. Unfortunately, a subtle race
condition in the code had escaped detection during ground testing and
was already in space. When the bug manifested in the wild--100 million
miles away from Earth--the team was able to diagnose and fix the running
code, allowing the experiments to complete.14 One of the programmers
described it as follows:

    Debugging a program running on a $100M piece of hardware that is 100
    million miles away is an interesting experience. Having a
    read-eval-print loop running on the spacecraft proved invaluable in
    finding and fixing the problem.

ドキドキもんだろうけど、楽しそうな体験ではある。