This was one of the first places I encountered after leaving the vault, and some guy there wanted my help fixing some broken pipes. I couldn't pass the persuasion check at the time so he wouldn't explain what his plan was. After a long time has passed, I finally went by there again and discovered a huge pit filled with raiders and legendary mirelurks, but the mirelurks weren't hostile to me.

What exactly was going on in this pit? I explored it and killed everything in it but wasn't able to find any terminals or notes of any kind explaining what was going on.

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1 Answer

If you pass the persuasion test in the initial conversation, Sully simply remarks that he might want to use the quarry to dump bodies.

To quote the fallout wiki;

After the player character completes the Pull the Plug quest and leaves the quarry, upon returning after a while, they will find that it has become occupied by a large band of raiders. Descending to the bottom will lead to a confrontation with a masked, well-armored Sully Mathis, who may be difficult to defeat at lower levels. If the Sole Survivor found Sully's journal holotape, they can discern he was already a Raider.

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