None have seen beyond the entrance to Remmorchant, the Net of Darkness, for that is the deepest and most subterranean of Ungwetári's tunnels, the pitted and sunless abyss into which she retreated after her unexpected injury at the hands of Samwise Gamgee and the point of Sting, the Gondolin-forged blade wielded by both Bilbo and Frodo Baggins, and later by the terrified but deadly gardener of Bag End.
Ungwetári knew nothing of those hobbits or the lineage that blade, but she remembers the pain of that encounter, and it has built in her a white-hot and blinding rage. In Remmorchant she broods upon her wound, and festers in her hatred.
It is into the Remmorchant that Celeborn of Lothlórien and his allies pursue Shelob after the end of the War of the Ring and the fall of Sauron.