Vault 111 is the first location where you will find yourself after awakening. You will face only weak radroaches here. The vault itself is on the northwestern edge of the map. Don't rush exploring it. Thoroughly search through each part of the complex, collect all valuable items, read their descriptions and application.
1. You will wake up in one of the two rooms with cryochambers. There is nothing interesting in any of them.
2. The computer on which you can play Fallout's version of Donkey Kong.
3. On the table there is a gun and some ammunition. It will be useful at the beginning of the game.
4. The container is secured with a master level lock. Inside there is the Cryolator, a very good weapon in the early phase of the game. You can get the item by returning there with the dog and ordering him to search for valuable items. He will walk towards the container and will take the rifle without the need of opening the chest.
5. The button that allows you to open the vault. Don't forget about searching the territory after leaving. You will find ammunition in few trailers.