千葉県富津市竹岡の小廃隧道。 灯籠坂隧道のすぐ近くに位置し、全長約15m、高さが1.5mほどしかなく大人が立って通行することも困難。 抜けた先は鉄道線路の上で、どこにも繋がっていない。
Small scrap tunnel of Futtsu city Chibaoka, Chiba Prefecture. Located in the immediate vicinity of Lanternozaka Tunnel, it is about 15 m in length and about 1.5 m in height, making it difficult for adults to stand and pass. The missing point is not connected anywhere on the railroad track.