Another is the use of marked lines on intercepting lines within the cave. If you come to an intersection where there is another line, you're supposed to mark the intersection with an arrow indicating the return route so you can feel your way out.
''She probably went over at least eight or nine intersecting lines which she never marked,'' he says.
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RIP.
posted by GuyZero at 9:56 AM on March 10, 2011