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Explore Vault 88
The story quest Explore Vault 88 is a DLC quest that is part of the Vault-Tec Workshop Walkthrough.
Time to do some searching in the vault. There are three different sections that you'll need to explore. Each one has a control board you need to find and a corresponding workshop where you can apply the board.
North Sector
Walk over to the sign for the North Sector and enter edit mode to clear out the giant pile of rubble. Make your way through the area, killing Mole Rats as you go by. Enter the tunnels and you'll eventually reach a subway section.
Walk around the overturned train car, clearing the area of ghouls as you go. Before you run off down the path on the right, continue going further down the tracks to enter the second part of the subway area. On top of the long cabinet table is the control board you'll need.
Enter the area on the right and continue on into another tunnel. This will take you to a big open area where you'll find the workbench for the North sector. Place the control board inside.
North East Sector
After activating the North Sector workbench, continue forward until you reach a junction. On the right is the North East workbench, but you'll need to find the control board first. Continue walk straight to go up the slope and into some kind of abandoned basement.
Going upstairs will lead to the Commonwealth, but the control board can be found if you go down the really steep stairs and into the room under the stairs. The control board is sitting on the rusted shelf.
Backtrack to the area where you went up the slope and down into the area with the North East Sector sign. Place the control board into the workbench.
East Sector
The East Sector is not connected like the others, so you'll have to return to the main room to get there. Return to the abandoned basement and go back down the steep stairs, but this time head into the tunnel. Prepare for another round of Mole Rats, but keep pushing through until you reach the stairs leading to the giant pile of rubble.
With the rubble removed, head over to the sign for the East Sector and remove the rubble out of the tunnel on the right. Walk all the way down, but don't cross into the tunnel on the left just yet. Walk all the way down and enter the room on the right to find the control board on the another set of rusted shelves.
Head into the second tunnel and make to the end. The workbench is there, but a Mirelurk Killclaw and a Glowing Mirelurk guard the area. Take care of them, but that won't be all!
A Mirelurk Queen will arise from the murky waters in the back. While this beast is not to joked with, you can take advantage of the small confined space, specifically the tunnels. The Mirelurk Queen won't fit into the tunnel, so step inside and start shooting from a distance. Do watch out for the poisonous slug that she spews out.
Once she's taken care of, activate the workbench for the East Sector. Return to Overseer Barstow near the entrance to Vault 88 and speak with her to start Power to the People.