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Parasitic ice covering the USS Discovery on The Colony in 3189
Parasitic ice was a form of ice that expanded rapidly, covering and eventually crushing everything it touched; Zareh noted he had once seen it enter a person's throat. Its growth accelerated in the shade.
The surface of the Colony contained glaciers of parasitic ice. In 3189, the USS Discovery crash-landed on one of these glaciers and was nearly enveloped by the ice before it was pulled free by a tractor beam from Michael Burnham's ship. (DIS: "Far From Home")
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