Several meters of debris... So we're to assume 20 feet or more deep? That'd be some slow progress.


"Glass, building facades, and rooftop mechanical equipment will create several meters of debris in urban street canyons in built-up areas within a few kilometers of the detonation site. Obstructions and debris will force evacuees to walk out rather than drive; thus, volunteers should be used to identify and create safe passages when it is safe to do so. Possible alternate evacuation routes can include subway tunnels or travel through large, intact structures."