Human Error

Human Error is a quest in Fallout 4.

Detailed walkthrough
The fishing spot is the location of the compound. The entrance is through the door in the middle pipe down in the water.

Places to investigate:

Bookcase in the center house just inside the door. Sleeping bag between Jacob Ogden's house and the guest house. One can learn about the existence of the compound from the store owner Penny with a Charisma check.

If told Honest Dan about the compound, he's waiting inside the outer door. He agrees to follow, but if the Sole Survivor accepts the compound's deal to let them kill Amelia, he'll become hostile.

Bugs

 * Deezer's Lemonade, might not spawn.