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I always wondered if Polar Bears were used to turn the wheel, due to their ability to withstand cold temperatures.
I don't think anything indicates this was going on though. Dharama build around the wheel chamber, and didn't seem to be actually using it, but rather manipulating the pocket.
I guess they were just being used for tests. Maybe they were easy to acquire illegally in the area?
Maybe they just wanted to see how well they adapted to the climate?
Most likely it was probably the writers choosing them because they'd provide the initial mystery of "a polar creature on a tropical island. that's strange."
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