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Returning to Freddy Fear's basement will reveal that the Motherlode has dug a tunnel. Talk with Paige and proceed to accompany the team (Paige, Jen, Sergeant Radcliff, and Penelope Hornwright) fighting mole miners in the tunnel. Afterward, one can command Motherlode to dig the final section of the tunnel, but in doing so will overload and destroy the robot.
Enter Vault 79 and destroy the robots and turrets. Talk to Jen at the laser grid. While waiting for Jen to disable the grid, fight off the next wave of robots. Then talk to Penelope, who worries for her safety. Send her back to Foundation or have her continue with the group.
After the turrets are disabled, fight past more robots and turrets. Feral ghouls and robots will attack once one reaches the atrium. Continue into the eastwards corridor to complete the quest and unlock the A Golden Future achievement/trophy.
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