Playing on Survivor Mode disables the ability for the player to active pause and sets the game on a very difficult setting. This forces the player to constantly be on the move and not allow for any breaks. There are a few ways around this however. One way is to select a strucutrte to build, which will pause the game and allow for a brief moment of rest and regroup. Pushing your people to the edge and keeping them on that edge is the only way that you can compelte this scenario.
Frostpunk New Home Scenario on Survivor Mode.