The Doctor and Clara land on a damaged Russian submarine in 1983 as it spirals out of control into the ocean depths. An alien creature is loose on board, having escaped from a block of Arctic ice. With tempers flaring and a cargo of nuclear weapons on board, it’s not just the crew but the whole of humanity at stake!

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  • Episode Number 8
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  • Originally Aired Saturday, April 13, 2013
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  • Last Updated By Maretoh
  • Last Updated 05/07/2016 6:48am

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