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I don't know who answered the original question, but you can find this information in the text.
"So that I had now a double wall; and my outer wall was thickened with
pieces of timber, old cables, and everything I could think of, to make it
strong, having in it seven little holes, about as big as I might put my arm out
at. In the inside of this I thickened my wall to above often feet thick, with
continual bringing earth out of my cave, and laying it at the foot of the wall,
and walking upon it; and through the seven holes I contrived to plant the
muskets, of which I took notice that I got seven on shore out of the ship."