It doesn't appear as a standalone work, but is included with several collections. The story is a prequel to the events in The Hitchhiker's Guide To The Galaxy and has the young Zaphod Beeblebrox working as a salvage ship operator. He guides some bureaucrats to a crashed spaceship which may be leaking some hazardous materials. The bureaucrats are determined to "make it safe". The comic asides in the story include some of the time travel paradoxes which are a common running theme in Adams' SF work, and plenty of material about lobsters

    Heated from below by the planet's seething core, it is the widest, deepest, most fearsome ocean in the solar system.Idealistic young American scientist Grant Archer joins a clandestine expedition to this awesome new world. But Grant does not share the ideals of the scientists he accompanies: he has been planted on their expedition by the New Morality, a religious group that wants to ferret out what the 'godless humanists' have discovered. His mission: to reassure the new religious leaders of Earth that Jupiter holds no intelligent life.But unknown to the New Morality, Grant, though the son of a minister, is both a believer and a man who sees no reason why science and faith can not co-exist. He has come to the vast, planet-girdling ocean of Jupiter with an open mind, and he is about to tell his masters something that may shatter their conviction.