Named after its reputation for collapsing, Okuzurekaigan is located on Route 416 along Suruga Bay, and is prone to tsunami, earthquakes, landslides, fires, and human accidents. The entrance tunnel facing Yaizu has now been closed indefinitely due to excessive damage and threats of natural disasters.
In 1971, the fifth tunnel along Route 150 (now known as Route 416) suffered a landslide, crushing a vehicle. Earlier in 1965, it is said a teenaged girl was trapped within an overturned car and subsequently burned to death when the vehicle caught fire.
Nearby, the old Ishibe Tunnel also has a history of human casualties after the walls caved in during its early construction, crushing twelve people.
It is believed that a female ghost wearing a white dress can be seen in and around the tunnel at night. She is observed to crawl towards the nearby road, flagging down passing cars in claims there has been an accident and assistance is required. People have reported hearing the tune of a music box before/after sighting her.
Video of man exploring the formerly-connected railway tunnel: