Add a new rule, “Shipping”:-

Each Shuttle has a Bay, which may contain zero or more tonnes of each Substance which a rule allows to be added to a Shuttle Bay. A Shuttle’s Bay contents are tracked in the “Bay” column of the GNDT, in a suggested format of “1 Sulphur, 2 Ice”. Shuttles default to having an empty Bay.

If the Orbit Number of a Shuttle’s Orbit is 1, it may spend 1 Fuel to take the following action corresponding to its Orbit’s Moon:-

• Io: Mine Sulphur, the Shuttle adding 1 tonne of Sulphur to its Bay.
• Europa: Mine Ice, the Shuttle adding 1 tonne of Ice to its Bay.
• Ganymede: Mine Iron or Ice, the Shuttle adding 1 tonne of the chosen Substance to its Bay.
• Callisto: CLASSIFIED. Nothing happens.