Vault 15, a prominent location in the Fallout series, is a place of intrigue and opportunity for survivors. If you've recently stumbled upon this vault, you might be wondering, "What should I do next?" This guide will walk you through the key aspects of Vault 15, helping you understand its significance and providing practical steps to make the most of your discovery.
Understanding Vault 15
Vault 15 is one of the original vaults constructed by the Vault-Tec Corporation before the Great War. It was designed to study the effects of radiation on its inhabitants, a secretive and unethical experiment known only to the highest echelons of Vault-Tec. Despite its sinister purpose, Vault 15 offers valuable resources and insights for those who can navigate its challenges.
Location and Access
Vault 15 is situated in the Mojave Wasteland, near the town of Nelson. To access the vault, you'll need to find the entrance, which is hidden behind a waterfall. Keep an eye out for the distinctive vault door, marked with the Vault-Tec logo, to locate the entrance.

Exploring Vault 15
Upon entering Vault 15, you'll find yourself in a dimly lit, claustrophobic environment. The vault is divided into several levels, each presenting unique challenges and rewards. Here's what you can expect to find as you explore:
- Level 1 - Entrance and Living Quarters: This level contains the vault's entrance, living quarters, and a makeshift infirmary. You'll find useful items such as stimpaks, purified water, and food scattered throughout the area.
- Level 2 - Dining Hall and Recreation: The dining hall offers more resources, including food and drink recipes. The recreation area contains a pool table and a terminal that can provide valuable information about the vault's inhabitants.
- Level 3 - Control Room and Experiment Chamber: The control room houses a powerful terminal that controls the vault's security systems. The experiment chamber is where the vault's true purpose is revealed, and you'll find the vault's overseer and other key characters.
Dealing with the Overseer
The overseer of Vault 15, known as James, is a crucial figure in the vault's story. His actions and decisions will shape the fate of the vault's inhabitants. You can choose to side with him, challenge his authority, or find a middle ground. Your choices will determine the outcome of the vault's experiment and the rewards you receive.
Unlocking Vault 15's Secrets
Vault 15 is filled with hidden rooms, secret passages, and locked terminals containing valuable information. To uncover these secrets, you'll need to solve puzzles, hack terminals, and search for hidden switches. Here are some tips to help you unlock the vault's mysteries:

- Hacking Terminals: To access locked terminals, you'll need to hack them using the S.P.E.C.I.A.L. perk 'Hacking.' The higher your hacking skill, the more terminals you can unlock. You can also use chems like Mentats to boost your hacking ability temporarily.
- Searching for Hidden Passages: Keep an eye out for suspicious walls, floor tiles, or other anomalies that might indicate a hidden passage. Using the 'Lockpick' perk can help you find and unlock hidden doors.
- Solving Puzzles: Vault 15 contains several puzzles, such as the vault door code and the experiment chamber's security system. Solving these puzzles will grant you access to unique items and areas.
Gathering Rewards
As you explore Vault 15 and complete its challenges, you'll amass a variety of rewards. These can include unique weapons, armor, chems, and other valuable items. Some of the most notable rewards are:
| Item | Location | Notes |
|---|---|---|
| Vault 15 Security Armor | Experiment Chamber | Requires completing the vault's experiment to obtain. |
| Vault 15 Security Pistol | Control Room | Found on a table in the control room. |
| Mentats | Various locations | Can be found throughout the vault and is useful for hacking terminals. |
Making a Difference
Vault 15's true purpose may be sinister, but that doesn't mean you can't use your discovery to make a positive difference. By exploring the vault and uncovering its secrets, you can gain valuable information about the world before the Great War and the true nature of the Vault-Tec Corporation. Additionally, you can choose to intervene in the vault's experiment, potentially saving the lives of its inhabitants and altering the course of history.
In the end, Vault 15 is a testament to the power of curiosity and the importance of uncovering the truth, no matter how dark it may be. By exploring its depths and making informed decisions, you can shape the future of the Mojave Wasteland and its inhabitants. So, what will you do with your discovery of Vault 15?























