Bolt-hole

[Justin Bieber]

a place that you can go to when you want to get away from your usual life and escape from other people:

[Franceswah]

a hole through which an animal may bolt when pursued into its burrow or den

[Merna]

A bolt-hole is a safe or restful place where someone can escape to and hide, often temporarily, usually during difficult or stressful situations. It also refers to a hole in a machine where a bolt is inserted.