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Would Gollum have been trapped? I mean there are no waters (That I know of) in Moria that house fish. So he probably would have eaten Goblins as he did time to time in his old abode. He would have had to learn secret hidden ways. I understand the East Gate was protected by the bridge but at the same time it creates a tough point of advance for an outgoing army as well. They probably had special Outswinging doors hidden along the exit way. Which he found and frequented in his hunt.
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