lateral tunnelの例文

• Lateral tunnels were also created to enhance drainage and ventilation.
• Up to 34 lateral tunnels each ending in a brood chamber branch off from the main tunnel.
• The other early method used was the digging of bell pits with lateral tunnels, called drifts, following the vein.
• The 55-foot ( 18 m ) shaft and subsequent lateral tunnel intersected the cave just above Collins, but when he was finally reached on February 17, he was already dead from exposure.