20m Hitachi Telescopic Dipper working depth demonstration Operator Skill excavator fail, bulldozer fails, top idiots, dump truck, machinery, channel, heavy, equipment, operator, skill, amazing, modern, construction, construction machine, caterpillar, hitachi, operator skill, machine, worst accident, accident, excavator disaster, fail win, excavator crash, excavator crash compilation, fail, disaster, truck, tractor, truck operator, truck driving, equipment fails, tractor stuck