While by now, most Fallout fans know about Fallout 4 inside and out, there are still areas that are not as widely explored in Fallout 4 as others. One such instance would include the secret hidden Vault 88 from the Vault-Tec Workshop DLC, located underneath the heavily fortified area of Quincy Quarries.

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Here you can go deep underground to a long thought lost Vault of the Commonwealth, where only the Vault’s lone Overseer remains, now in a ghoul state. Here are ten things not all fans knew they could do here.

Updated August 24, 2021, by Michael Caruso: Vault 88 is one of the biggest underground areas in Fallout 4, so it's not a surprise that there are many different things to experience within it. There are different ways to build your base that we didn't originally include, so here are a few more things to do in Vault 88 that will keep you busy building your vault and exploring the expansive caverns.

12 Build An Underground Beach

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In the caverns of Vault 88, there's a small pool of water that you can build around. If you build vault walls around this pool, then you can effectively create your own underground beach.

What makes building a beach in Fallout 4 so fun is all the customization choices you have for decoration. With each DLC and settlement mod, there are even more ways to customize this pool of water into the best beach in Fallout 4.

11 Install The Conquest Mod And Expand Your Settlement Outside Of Vault 88

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Every settlement builder should install the Conquest mod because it allows you to build a settlement wherever you want in the Wasteland, regardless of where you are. One of the best ways to use the Conquest mod for building in Vault 88 is to extend your settlement outside of the cavern and into the quarry, where you can then build guard towers and house even more settlers.

Vault 88 is already one of the biggest settlements in Fallout 4, but it can be made even larger with the Conquest mod and a bit of creativity.

10 Scrap The Broken Vault For Materials

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Like all settlements of the Commonwealth in Fallout 4, this area is filled to the brim with broken items, buildings, building materials, and more, showcasing the visual representation of a post-apocalyptic setting. As it happens with all of these broken things in the game world, you can scrap these to contribute to building materials for your own settlement.

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What’s interesting about Vault 88 is that it's filled with mounds of broken concrete, walls that you can scrap, radioactive material, and so much more, making this rich with building materials for the Vault and even beyond.

9 Explore More Underground Railway Systems

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Vault 88 is a massive area to explore, to say the least. It has several large chambers filled with debris from before the war and enemies of all types and classes waiting to attack the Vault Dweller upon their entry into the destroyed Vault. One such area waiting to be explored is the underground railroad system.

Much like the other railroad systems, the tunnels are nearly collapsed and destroyed, filled with long destroyed trains. Beware, however, as feral ghouls are nesting inside this area, making for a tough battle if you aren’t prepared for a fight.

8 Locate The Rare X-cell Item

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One thing you can do in Vault 88 that many don’t realize is that you can find one of the game’s most rare inhalants, the X-cell. Located on the northeast section of Vault 88 in a store, you can find the item near a statue wearing a sea captain’s hat.

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One of the reason’s this chem is so rare is that it used to be sold on the black market due to its highly addictive nature. Wastelanders who consume the inhalant will be surprised to see all of their SPECIAL attributes raised by two points.

7 Open Two Secret Backdoor Entrances

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Once the long-abandoned Vault 88 has been scrapped of all necessary debris and materials and the Vault is ready to be constructed from scratch, fans will notice that two separate back entrances can be found that exit to well-known locations in the Commonwealth.

The first back entrance opens up to Fallon’s Department Store, while the other opens up to University Point. The tricky thing, however, about these areas is they are filled with several enemies, with the first entrance location leading to super mutants and the other to Synths, and this will leave the Vault open to attacks.

6 Put Ten Extra Settlers Than Normal In Your Vault

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One of the most important aspects of any settlement that you build within Fallout 4 is the characters that you choose to settle into the settlement after it’s been built. Placing beacons to draw settlers into any settlement is crucial to maintaining the food stores, water, maintenance, security, and more.

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One thing you may not realize is that in Vault 88, you can add an additional ten settlers into the Vault which is more than any other settlement before. The limit for settlers is extended, allowing a larger amount of vendors, traders, and other settlers to arrive as well.

5 Unlock Multiple Workshops

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While a large part of this mechanic happens to be related to one of the Vault’s main quests, you may not realize that throughout the Vault, there are multiple workshops and workstations available to use in any given section. The area is so large that it's divided into sectors, allowing for multiple workshops to be opened.

This is helpful in the game’s main quest for this area, which includes going to each sector and unlocking the workshops after finding the computer boards, allowing you to start scrapping items, and rebuilding those sectors if you choose.

4 Fight A Legendary Deathclaw

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There are no shortages in regards to the enemies that you can find within Vault 88. The Vault-Tec DLC is filled with not just one or two types of enemies but a variety of them. From feral ghouls and invading raiders from outside the Vault to wild molerats and more, this Vault has it all.

Two of the more powerful animal enemies you will face in Vault 88 are quite legendary. The first of these is the Legendary Deathclaw. Deathclaws are, by definition, very powerful on their own, but this one can mutate and become more powerful.

3 Fight Multiple Radscorpion Nests

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There is a second group of animals that are very powerful in the Fallout franchise and a major battle is waiting to happen in Vault 88. This animal is the radscorpion, and they are almost as powerful as Deathclaws, especially when they gather in large numbers or nests.

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There is one large nest of at least seven radscorpions within Vault 88. This leads to a major battle, so have the workshop open and build as many defenses/turrets as possible, and always have them handy while traversing deeper and deeper into the various sectors of Vault 88.

2 Test Vault Dwellers With Vault-Tec Experiments

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One of the reasons this Vault is so large is that it was originally constructed to run a variety of tests on the Vault Dwellers who were to live in this Vault. However, the bombs fell before it could be completed, and only the Overseer and her Security Chief survived the blasts.

As many Fallout fans know, the testing of Vault Dwellers is not new. Each Vault has its own unique testing parameters in place. Here you see how the testing process was made, tasked with testing new dwellers with energy bikes and slot machines, all of which are rigged.

1 Build The Largest Settlement In The Commonwealth

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After all of the debris and building materials have been scrapped and added to the workbench of Vault 88, after the enemies have been cleared out of the various sectors of the Vault, and even after the Overseer’s tests have been completed one way or another, then you can finally begin to build the largest settlement in the Commonwealth.

The area is large and filled with so many sectors that you will need to not only gather as much material from the debris in the Vault, but also go beyond the Vault's materials to fully rebuild the settlement.

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