沿層 えんそう坑道 こうどうじゃなかったです
ensōkōdōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 沿層坑道

1. Wasn't along the layered tunnel.; Wasn't following the layered path.

Past/Perfective
Negative
Polite
Casual Register