Love your mountains & the old roads....it was quite a challenge to get to the tunnel! Was it made by people or is it naturally like that? Did you say this is your 200th video? The Japanese translation to English wasn't very clear 👍😊
Thank you for always watching and commenting 😊 Sorry, I didn't create subtitles this time. On the sub-channel "Shiromanbou", we are exploring the unexcavated tunnels in the Boso Peninsula (Chiba Prefecture), and since we have reached the 200th tunnel, we have featured it on this channel. It was dug by hand.