The 'tunnel' tree, a giant sequoia called the Pioneer Cabin, was one of the oldest residents of the Calaveras County's Big Trees State Park in California, US.
Visitors could once drive through the tree, but of late it was open only to hikers along a 1.5-mile loop.
The giant sequoias in the state park - the tallest of which is 250 feet - are estimated to be more than 1,000 years old, 'Los Angeles Times' reported.
"We lost an old friend today," county resident Jim Allday, who posted a picture of the fallen titan on his Facebook page. His photos show the tree trunk splintered heavily at its base.
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