The party tracks the spiders to the west. Hot on the spiders' trail, the hobbets pass by two side passages (shown on the map). Continuing west, the tunnel emerges at the eastern edge of a large cavern (Area 3).
Our heroes sense they are at the edge of a vast, echoing cavern that stretches far beyond the range of lantern light. The cavern ceiling arches out of sight (higher than 30'). Thick as cables, there are multiple strands of spider silk scattered throughout the cavern, leading from the floor up into the dark ceiling rafters. Two of the nearest spider-cables are vibrating (like spiders just ran up them).