沿層 えんそう坑道 こうどうではありませんでした
ensōkōdōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 沿層坑道

1. Was not along the layered tunnel.; Was not a layered tunnel route.

Past/Perfective
Negative
Polite
Formal Register