? ? ? ? Early the next morning Xodar and I commenced work upon our plans for escape. First I had him sketch upon the stone floor of our cell as accurate a map of the south polar regions as was possible with the crude instruments at our disposal--a buckle from my harness, and the sharp edge of the wondrous gem I had taken from Sator Throg.
? ? ? ? From this I computed the general direction of Helium and the distance at which it lay from the opening which led to Omean.
? ? ? ? Then I had him draw a map of Omean, indicating plainly the position of Shador and of the opening in the dome which led to the outer world.
? ? ? ? These I studied until they were indelibly imprinted in my memory. From Xodar I learned the duties and customs of the guards who patrolled Shador. It seemed that during the hours set aside for sleep only one man was on duty at a time. He paced a beat that passed around the prison, at a distance of about a hundred feet from the building.
? ? ? ? The pace of the sentries, Xodar said, was very slow, requiring nearly ten minutes to make a single round. This meant that for practically five minutes at a time each side of the prison was unguarded as the sentry pursued his snail like pace upon the opposite side.
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