An explorer has discovered a cave hidden under a mountain in Japan which locals know as the "entrance to hell".
The rural town of Pippu has around 4,000 residents and is usually just a stopping off point as travellers journey through to the bustling city of Asahikawa a few miles on.
Seiji Nakazawafor was on his way through the north of the country when someone he met on his journey told him about a cave that is rumoured to be a portal to the fiery pit.
