11.1 An Excavation Ditch hex is represented on the BRT map by a light-color interior bordered by two-toned brown contour lines (with the darker contour lines on the outside) (EX: hex H10). Excavation Ditches are treated as shellholes (B2.) except that a vehicle entering or changing VCA in an Excavation Ditch is subject to a Bog Check with a +3 DRM.