The Tunnelers

The Tunnelers is a quest in the Fallout: New Vegas add-on Lonesome Road.

Quick walkthrough
The quest begins when you enter The Cave of the Abaddon. During your journey, you will encounter many Tunnelers and the Tunneler Queen. The quest ends when you've exited the Boxwood hotel roof.

BEWARE: when you approach the end of the cave you will see an archway, when you pass through that the tunneler queen and at least 4 tunnelers of varying types will appear, and it is very easy to be overwhelmed by them. High level characters will also face a tough fight here. Please also note that when you exit the cave, another conversation with Ulysees begins and ED-E will be taken away from the player. As well as losing ED-E as a companion, everything that ED-E was carrying will also be given back to the player.