The Knoxville Fire Department is working to put the flames out of a structure fire off Louisville Drive as of Saturday.
Firefighters at the scene say the building, Aquarium Life Support Systems, was unoccupied.
One firefighter had to be sent to a local hospital because of smoke inhalation and is expected to be fine, according to one firefighter at the scene.
KFD shared a video of firefighters putting the flames out on Twitter.
Firefighters are not sure how the fire started, but they know the fire started somewhere in the basement.