Japan has one of the world's densest networks of abandoned mountain tunnels, and a striking number of them carry ghost stories — old rail beds, disused prefectural roads, and Meiji- or Showa-era bores that were bypassed by newer, straighter routes. “The former Kamozaka Tunnel” is one of the names circulating in English-language horror-content compilations, but it does not correspond to any tunnel we could independently confirm.
The Real History
We ran an extensive search across both Japanese and English sources — location databases, prefectural infrastructure records, and Japan's most active urban-exploration and “haunted spot” cataloguing sites — and found no tunnel officially or colloquially known as 鴨坂トンネル (“Kamozaka Tunnel”) or 旧鴨坂トンネル (“former Kamozaka Tunnel”). No civil engineering record, no Wikipedia entry, no prefectural roads-history page, and no Japanese ghost-story forum uses this exact name.
What does exist, and what this name may be a garbled version of, are several similarly named tunnels that are genuinely documented and do carry haunted reputations: the old Misaka Tunnel (旧御坂トンネル) in Yamanashi Prefecture, completed in 1933 after a construction project that mobilized more than 360,000 laborers over roughly a year; the old Honzaka Tunnel (旧本坂トンネル), an Edo-period mountain pass route on the Aichi–Shizuoka border superseded by a new toll tunnel in 1978; and the Aisaka Tunnel (相坂トンネル) in Hyogo Prefecture, a narrow Taisho-era (1921) bore where the skeletal remains of a child were discovered nearby in 2000.
Given the phonetic overlap (“saka” — meaning slope or hill — is a common element in Japanese tunnel names), “Kamozaka” appears most likely to be either a mishearing, a mistranslation, or a conflation of one of these real locations rather than a distinct site.
The Haunting
Because no verifiable tunnel by this name exists, we cannot responsibly relay a specific haunting narrative attached to a “Kamozaka Tunnel” — doing so would mean inventing details, which this article will not do. What can be said is that the broader genre of story it belongs to is extremely consistent across Japan's disused mountain tunnels: locals describe them as sites of a fatal accident, wartime death, or unresolved disappearance during construction; visitors report engine stalls, disembodied footsteps, or a sensation of being watched inside the old bore.
Can You Visit?
Because we cannot confirm which physical tunnel this name refers to, we cannot responsibly advise on access, safety, or legality here. If you encountered this name in a video or listicle, it may actually be referring to the old Misaka Tunnel, old Honzaka Tunnel, or Aisaka Tunnel — all three are real, documented, and separately covered on Japanese haunted-spot databases.
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