coil- to wind around and around, forming a pile
descent- the act of moving down from a higher to a lower place
foresaw- saw or knew before hand
rappel- to lower yourself down the face of a cliff by means of a rope fastened to the top of the cliff and placed around your body, so the rope can be gradually lengthened
ridge- the long, narrow upper party of something
shaft- a long, narrow, usually vertical hole
trekked- traveled slowly by any means
void- an empty space