Game Of Thrones: “The Watchers On The Wall” [s4e9]

There actually was an effective way to block that lower gate – flood the tunnel, let it freeze and suddenly, no more tunnel. I assume this is what was also done in the other parts of the wall that were unguarded, but it wasn’t done at Castle Black because the commander balked at the idea of no longer being able to use the tunnel themselves – and also, on principle, because Jon suggested it.

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