Since you do not have a camera and what cable to lay in would be a guess, how about running some of that blue plastic conduit up to the area. Measure and mark the location of the end and later if you decide to run a camera you can snake the cable in ...
I do woodworking in the winter and on another site I posted this about what I did to solve those deep shelves.Since I can't seem to put pictures in on this site I'll reference the one I can post the pics.http://www.bt3central.com/showthread.php?p=406...