Board Thread:Wiki-Related Discussion/@comment-34924658-20151116202530/@comment-25733960-20151201012324

We already saw the Underworld

At the beginning of 5x10 Hook was there when he was surrounded by the Darkness

At least this is how I see it:

Hook died when he was with Emma

He went to the Underworld and the Darkness found him after Emma tethered his soul to Excalibur

He reappeared in the vault as Dark Hook

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We didn't see Emma going to that obscure place when she became the Dak One