It did never make sense to me. 8 kilometer long tunnel, how the heck did you accurately connect it. They told the story but there was not much accuracy of wher

It did never make sense to me. 8 kilometer long tunnel, how the heck did you accurately connect it. They told the story but there was not much accuracy of where it was. Baddies come, you hide in the ground, they light fires on top and kill you all or bury you etc. Being in a constrictive space with the enemy outside seemed a bad idea. It's not like bunkers which are used against aerial bombings. Or escape tunnels to go from A to B.