A contracted worker fell into a tank on Wednesday at Husky Energy refinery in Superior, surviving a fall of roughly 20 feet.
The Superior Fire Department responded to the site at 2407 Stinson Ave., and the man was transported to a local hospital.
"It had the potential to be a bad one," Battalion Chief Howard Huber said. "He was very fortunate."
Authorities were called to the site at 8:22 a.m., and the man had already been removed from the tank and was not obviously injured.
"In the end, it was a minor incident," Huber said.
The Husky Energy refinery has been in the spotlight since an explosion and asphalt fire at the refinery that caused the evacuation of half of Superior in the spring of 2018.
Since the explosion, the refinery has been entered into a local debate over its storing of hydrogen fluoride — a chemical with potential for widespread hazardous health effects if released, ranging from lung damage to severe burns depending on the amount and length of exposure.