Survival Mode (Fallout Shelter)

Survival Mode is an optional gameplay setting Survival Mode was announced and added to the game for Update 1.2 on October 15, 2015.

Overview
Survival Mode is enabled by checking the corresponding box above the vault number selection when creating a new vault. It cannot be enabled or disabled from an existing vault. When selecting the Survival Mode button while creating a Vault, the game will display a message advising the player not to choose this difficulty unless they are experienced.

Features

 * Resources drain at a faster rate.
 * Incidents do more damage.
 * Vault Dwellers can't be revived, whether in the Vault, in the Wasteland, or on quests.
 * Objectives are more demanding, but give better rewards.
 * Quests are more challenging.
 * Deathclaws start appearing at 35+ dwellers instead of 60+.