چهرآهن

Pickaxe Mountain Elevation Profile: Where are the tunnel site’s key features? We used Google Earth terrain data to derive the elevation profile of the mountain, showing the elevation levels of four key points: the eastern and western primary tunnel entrances, the probable ventilation port/shaft north of the ridge, and the possible ventilation shaft south of the ridge.  We previously reported on the elevation difference between the two pairs of tunnel entrances, which could mean that there are two separate tunnels; the facility has multiple levels; or the western tunnel progresses downwards to meet the other tunnel under the ridge.  In our early 2022 reporting, we considered various options which remain plausible. We newly discuss the elevation of the probable ventilation port/shaft, first identified by the Institute in 2024, and situated north of the mountain ridge, closer to the Eastern tunnel entrances. Interestingly, it sits at the same elevation as the Western entrances, indicating it is able to service either tunnel, both tunnels, or a combined tunnel.  It might also provide an opening for a horizontal tunnel into the western tunnel accessible operations area, i.e., an additional point for ingress and egress, such as for personnel.  It should be noted that it is serviced by electricity,  in addition to the primary eastern and the primary western tunnel portals.  The attached ground photo from 2005 shows its future location on the north side of the mountain.  Note: We confirmed the relative accuracy of the Google Earth elevation profile with high resolution elevation data. Read the full report here: isis-online.org/isis-reports…