So they were not able to scale it, nor could they make a hole in it.
Unorthodox
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" it is a great barrier cuts the tunnelly land from the shell-curvature to (the opposite) shell-curvature, but it is not sealed from the top surely it has a great opening, but it is flat, smooth, and high so gog and magog can not scale it to break in from the opening at the top of the barrier, as well they could not make a hole"