Hiding a Safe can be achieved in many ways.

Trap Doors: These Hidden Doors can be useful for hiding small safes and quick access to utilities in crawl spaces but can also serve as fire escapes (secret passages that lead to a below ground safe room or an exterior exit from the home!) When in a fire one should get as low as possible to avoid the smoke and flames but what if your exit is blocked? In this case you need a trap door in the floor!