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Freefall in color by many folks.

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Perth Hillman: We do have a reactor out for maintenance. Should the other reactor go down, we have three emergency reactors.
Perth Hillman: They're fission reactors, which is as simple as it gets to generate power. You have two pieces of metal. You pull them apart and they get hot.
Sam: How long will they last?
Perth Hillman: Each reactor can provide lifeboat power for five years. When you're out as far as we are, you have to plan on rescues taking a while.