What should you do if you hear a loud noise while sheltered in place?

Staying quiet and waiting for confirmation is the most appropriate action to take if you hear a loud noise while sheltered in place. This approach allows you to listen for additional information or instructions that may provide context for the situation. By remaining quiet, you reduce the risk of drawing attention to yourself and can better assess your surroundings. This waiting period is crucial, especially in potential emergency scenarios, as it helps you receive updates from authorities or understand the severity of the noise without exposing yourself to unnecessary danger.

Other options, while they may seem reasonable in certain contexts, do not prioritize safety in a shelter-in-place situation. Leaving the shelter without proper information could expose you to greater risk. Investigating the source of the noise could also lead you into a hazardous situation without understanding what you're approaching. Contacting emergency services might be a good idea after gaining more information but should not be the immediate response without confirming your safety first. Thus, remaining calm and waiting for instructions is a prudent decision in this scenario.