海中 かいちゅう展望 てんぼう だいじゃなかったです
kaichūtembōdaija nakattadesu

Noun
Desu Copula

The polite, past negative form of 海中展望台

1. Wasn't an undersea observatory.; Wasn't the undersea observation deck.

Past/Perfective
Negative
Polite
Casual Register