Klaxon

-What’s that loud noise?
-It’s the first Saturday of the month. They’re testing the alarm system
-No, It’s Wednesday.
-Do you think it’s a real emergency?
-I’ve only ever heard it go off once a month on a Saturday.
The ground shook and rumbled. The concrete of the street cracked open. Heat escaped from a deep hole along with a roar so loud the warning of the klaxon could no longer be heard.