Belly of the Beast

Belly of the Beast is a main quest in Fallout 76.

Quick walkthrough

 * Use four Brotherhood emergency transponder radios to find Elizabeth Taggerdy's location. Game doesn't checkpoint radio progress, so if logged out, likely will have to start over to maintain radio progress until get inside cavern for location guide to Taggerdy (large cavern).
 * Head to and enter the glassed cavern
 * Make your way through the caverns towards the last transponder radio
 * Kill the scorchbeast blocking you from the last transponder, if necessary
 * Use the last transponder next to Taggerdy's body
 * Pick up Lieutenant Elizabeth Taggerdy's ID from her corpse so that you can access the information on her terminal and also use it to access the elevator outside the Asylum if you don't have your own military ID.
 * Get out of the Caverns and head back to Fort Defiance. There is an exit near Taggerdy to leave the caverns if necessary
 * Use Taggerdy's terminal to learn more about the Scorched, scorchbeasts, and ultracite power armor.

Detailed walkthrough
This quest consists of five beacons that must be located in sequence before ultimately leading you back to Fort Defiance to Elizabeth Taggerdy terminal. There is no saved progress should you choose to log off during this quest so be prepared to invest the time to complete it once you start. See the gallery for map locations and screenshots.

Beacon 1 is located on the road between Fort Defiance and Watoga. Be prepared to battle Scorched, mirelurks, cave crickets, robots, or some combination thereof. Approach and interact with the transponder relay to listen and acquire coordinates of the next beacon.

Beacon 2 is located in Watoga, by the crashed vertibot in front of AMS corporate headquarters. Be prepared to battle robots and Scorched. Approach and interact with the transponder relay to listen and acquire coordinates of the next beacon.

Beacon 3 is located at Survey camp Alpha. Be prepared to battle Scorched and a Scorchbeast. You may need to repair the automated surface to air missile that will attack the Scorchbeast and the Scorched. It may need to be repaired during the battle. Approach and interact with the transponder relay to listen and acquire coordinates of the next beacon.

Beacon 4 is located at Drop site V9, on top of the bunker. Be prepared to battle many Scorched. Approach and interact with the transponder relay to listen and acquire coordinates of the next beacon at the glassed cavern.

Beacon 5 is located in the Glassed Cavern. This is a major undertaking. As you progress through the cavern, you should be prepared to battle many each new area will Scorched, mirelurks, King Mirelurks, Fog crawlers, and as you approach the last Beacon Location, a Scorchbeast. Approach and interact with the transponder relay to listen and acquire the final location for the quest. Take the elevator to the surface and proceed to Elizabeth Taggerdy terminal in back in Fort Defiance.