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The end of this passage levels off for 29 feet, has an unfinished niche, and then leads to a subterranean chamber. This curious chamber is only roughly hewn out of the bedrock and looks almost as though it is a quarry.
Along the east wall, halfway between the north and south walls, is a square cut shaft that has a depth of 15 ft. The bottom of this shaft is filled with rubble and debris and one account mentions that when cleared the shaft has a depth of almost 60 ft!
Originally posted by Being_From_Earth
And someone else said it was to do with an escape route for the last person in the tomb because they were heavily boobytrapped and it was the only last way out.