Vertical Shafts Vent shaft 10 m dia, build 1 m/day, excavate at 80 m3/day Vent shaft connecting tunnels 6m dia, build 0.75 m/day, excavate at 21 m3/day Book traversal links for Vertical Shafts ‹ Headings & Hand Tunneling Up Immersed & Sunken Tubes › Log in or register to post comments