Sorry I have to do it quik so the thing here under stay.

Base camp on the books was fine for the night, but staying cooped up inside ruins an explorer's edge. I made my way down to the perimeter where the sliding glass door stood cracked open. Between me and the outside world lay the deep aluminum channels of the door runner—three parallel metal trenches. I jammed the tip of my machete into the bottom of the central groove to check for slick grease or dust traps. The blade bit solid metal with a sharp click. Leaning forward on the hilt, I stepped right over the final ridge and made it onto the concrete patio.