The Tunnel Roar

I marched straight off the wooden plains into the long hallway! *Gasp!* Up against the wall stood a hollow cardboard mailing tube, resting flat on the floor like a giant stone cavern. I didn't hesitate—I plunged my head right inside the round opening and let out my fiercest roar! *ROOOAR!* The sound rattled through the tube and boomed back twice as loud! My whole snout buzzed from the vibration, making me stumble back with a triumphant stomp!