Water tokens represent the vital water reserves on Mars. Most of the water found on Mars is in the form of ice. After being located in sub-surface glaciers, ice is melted via hot water pumps, filtered and stored for colony use.
It is an early building block in the resource chain, as it is not only required by the astronauts, but also plays an important role in growing crops. Additionally, water is a key component in the formation of rocket fuel on Mars and so ensuring a continuous supply of this precious commodity is vital.
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