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| A bucket-wheel excavator, used in Earth-based mining. |
Machines like this, designed for continuous digging in large scale mining operations, are now restricted to Earth, but in the future, they could be used on other planets, like Mars, or even the Moon, to mine for ice and other minerals. They are capable of digging a hole 300 feet long and 75 feet deep in one day, but alas, they can only travel at 1 kilometer an hour.
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