-D&D over underground transport lines.

-ONE DOES NOT SIMPLY; TO RUN OVER HURRY MOVING STEPS OF WORKING UNDERGROUND METROPOLITAN'S HIGH STAIRS FOR GET IN THE TRANSPORT WAGON WITH NO RISK AS FALLING DOWN ALONG LADDER'S HEIGHT CAUSE BEFORE EYES THE PICTURE BEEN COLLECTED HOW SINGLE PART, LOOSING DIFFERENCE BETWEEN DOING NEXT FOOT IS STOMPED SAFELY.