海中 かいちゅう展望 てんぼう台 だい

kai chūtembōdai

1. Not a marine observation deck.

1. Was an undersea observatory.

1. At the underwater observatory; In/at the underwater viewing platform

1. Seaview; Ocean view

1. It is not a marine observation deck.; It's not an ocean view platform.

1. It's not the ocean view platform.; It isn't the ocean observation deck.

1. It was an undersea observatory.

1. Seaview observatory.

1. It is not a marine observation deck.; It is not an ocean view platform.

1. Wasn't an ocean view platform.

1. Probably an underwater observatory.

1. It wasn't an underwater observatory.; It wasn't the underwater observation deck.

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

1. Probably an underwater observatory.

1. It was not a marine observation deck.

1. If it were a marine observation deck; If it was a marine observation deck

1. If it were a marine observation deck; If it is a marine observation deck

1. If/when the undersea observatory…; Provided the undersea observatory…