Quote Originally Posted by FiReSTaRT View Post
Actually that's a very good idea.. If we can wedge the vehicle in and pull the line through, using it to send the cabling all the way in, that would solve the problem.
Your other point is a detail that I'm fairly uncertain about is because at the beginning of the line, there's a modular probe with 8 different terminals (1 per data channel) How that's supposed to work is still beyond me, but I'll have alex write a paragraph about it tomorrow.
By the way, is there a fishing line that can pull about 250lbs of weight?

Actually, that's what I meant in my earlier post #11. Electricians do this all the time. What I was suggesting is a very very light poly type line, maybe even polyester thread. Once it's through, you use the end to pull through a larger line of the same type. Repeat a few times until you can get something though with enough tensile strength and durability to haul your data cabling through. And, as for the width, that's why I drew my sketch with the motor dragging behind the crawlers. This way, you could keep the overall minimum diameter of the crawler small. You could pull extra batteries for this trailing behind, so that you can get the distance you're looking for on the crawl. They could have rollers or wheels to lessen their friction. I mention drills because the small motors used in modern DC hand tools are the state of the art in specific power, and can be had cheaply. They also are in the 1 1/4-1 1/2" OD range.