Alpha Sigma 3 was a planet with abundant oil producing bacteria, so successful was this life form that after millions of years the planet was covered in huge lakes and seas of oil. Unfortunately the planet was hit by a massive meteorite that smashed it to pieces.
Humanity arrived hundreds of thousands of years later and discovered the seas of oil had frozen into asteroids of all sizes made almost entirely of crude oil.
Soon the petroleum companies arrived, refineries were set up on a nearby Mars like planet and the mining of the asteroids began!
The 'Zeekreeft' is a sampling and exploratory craft for checking quality and consistency of targeted oil asteroids. The pilots can get very bored and some amuse themselves by getting together and playing a strange zero-gee version of baseball in their ships. Weird really.