You can also stop incidents immediately by removing all Dwellers from the room. Prevents incidents from spreading from room to room. Similar to the 3-4-1, but allows the Vault to avoid having a single room on every floor at a small cost in movement efficiency. It is also aesthetically pleasing with it’s symmetry, and guarantees that a Dweller is never further than three rooms from an elevator (Note: hyphens indicate elevator placement)Ī really efficient layout to use is having triple rooms on the outside and doubles on the inside. Below are a few different layouts for you to try keep your vault running smoothly. Starting your vault out on a good foot can make a huge difference in the long run! Since Bethesda gave us a ton of space to use for out vaults, it allows the player to get quite creative with their designs.

External attacks will often occur immediately after sending a dweller outside.UPDATE: Layouts changed to reflect our knowledge of game’s mechanics.

Deathclaw attacks start appearing when the vault has 60+ dwellers.

Radscorpion attacks start appearing at vault population of 50+.

Feral ghoul attacks start appearing at vault population of 40+.

Raider attacks start appearing at vault population of 14+.

Difficulty of the incident depends on the size and the level of the room it starts in.

External attacks cannot be caused by failing to rush a room.

Mole rat incidents will start in rooms touching dirt, including the 'stone' on the edge of the build area.

Possible incidents include radroach, mole rat and radscorpion infestations, fires, and raider, feral ghoul, alien, or deathclaw attacks. During an incident, dwellers in the same room are damaged and will not produce anything until the incident has been resolved.

Incidents need to be dealt with quickly by dwellers or they will spread to adjacent rooms. Incidents can happen randomly, or when the rushing of a room fails.

Fallout shelter base layout