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What is the Hydra?

By Bonnie Covel, About.com

Question: What is the Hydra?
The Hydra was first introduced in Episode 3x1, A Tale of Two Cities.
Answer: The Dharma Initiative called the underwater hatch the Hydra, according to Juliet. After being captured by the Others, Jack is held captive in the Hydra, interacting only with Juliet and occasionally with Ben.

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