漸深 ぜんしん海帯 かいたいじゃありませんでした
zenshinka itaija arimasendeshita

Noun
Desu Copula

The polite, past negative form of 漸深海帯

1. Was not a deep-sea zone.; Wasn't a deep-sea zone.

Past/Perfective
Negative
Polite
Terminal Form