The Tunnel of Terror, also known as the Marina Caves or Univac Caves in St. Paul, MN, has a rich history that extends beyond its original purpose as a sand mine. Initially mined by Ford for 1.5 miles of passages below what is now Shepard Road, these caverns were large enough to accommodate significant boat storage and were even considered for civil defense sheltering up to 1,953 occupants. Despite an ambitious start, including a substantial investment to make the caves suitable for boat storage, issues with mice, mold, and structural integrity led to the venture's failure.
In 1982, the transformation of the eastern third of this mine network into the Tunnel of Terror Halloween attraction by the Jaycees marked a new chapter in its history. This event, initially lacking elaborate setups, evolved over 22 years into a highly anticipated and elaborate Halloween experience, drawing as many as 12,000 visitors annually. The attraction featured live bats, elaborate set pieces like The Unholy Tomb and the Sanitarium, and was known for its immersive and terrifying experience, deemed too scary for children but with special arrangements for a less frightening Kid’s Day.
The Tunnel of Terror's popularity was evident in the long lines of visitors and the detailed, evolving Halloween tableaus that volunteers and organizers like Mike Kamrad developed. The event's closure in 2004 ended a unique chapter in St. Paul's history, leaving behind memories of a distinctive and eerie attraction that combined the natural creepiness of the caves with the creative efforts of its organizers to scare and entertain.