The Everett Fire Department spent Thursday investigating a 45-foot-long man-made tunnel near the Interstate 5 offramp at Pacific Avenue, though they said later in the day they didn’t find anyone inside.

Crews responded to the site at about 8 a.m. after receiving a report from the Washington State Department of Transportation about a hole leading to the tunnel, according to the fire department.

WSDOT workers had spotted an individual near the tunnel Wednesday evening, which led authorities on Thursday to be initially concerned a person may be trapped inside as dirt had covered the tunnel’s entrance.

However, crews later discovered the tunnel was intact, according to Everett Fire. And it did not appear to lead under the offramp.

Everett Police Department spokesperson Officer Kerby Duncan said while authorities didn’t believe a person was inside, police and personnel from multiple agencies assisted Thursday afternoon to remove dirt from the tunnel and gain better visuals using a camera to confirm there were “no life safety concerns.”

Just before 3 p.m., rescuers reached the end of the tunnel without finding anyone inside, fire officials said.

The scene was turned over to the Washington Department of Transportation and Everett Public Works to “repair the land where the tunnel was dug,” Everett Fire said on Twitter.

No further information about who dug the tunnel or why was immediately available.