Employee Austin Wood said someone came inside the building and said a 1,000 gallon propane tank that fuels their trucks was on fire. He said said approximately 10 to 15 employees who were inside were evacuated.
When Charlie Hassel stepped outside, he knew this fire was nothing to take lightly.
"We went back inside and shortly after we were instructed to get out of the building. That it was a propane tank that was involved and it might blow," he said.
A fire truck was set up with a hose spraying cold water on the flames coming from the tank. Everyone, including firefighters, then moved approximately a quarter of a mile away from the fire in case of an explosion.
Shortly after 6 a.m., there was what seemed like a small explosion, which was likely due to a a relief valve that released pressure from the heated tank, trying to prevent a larger explosion.
"It's like a balloon, it can only hold so much pressure," said Nashville firefighter Buddy Byers.
Firefighters said if the tank had exploded, its radius could rach up to a half mile.
Since authorities were keeping a safe distance, they monitored Sky 5 video from NewsChannel 5's live truck on the scene.
Finally, the flames went out around 8 a.m. A nearby forklift was destroyed by the fire.
It's still unclear what started the fire. No injuries were reported.
The nearby greenway was closed, and many nearby roads were blocked by fire equipment.