YOU SAID:

As under a green sea, I saw him drowning.

INTO JAPANESE

グリーンの海で溺死彼を見た。

BACK INTO ENGLISH

Drowning in a sea of green saw him.

INTO JAPANESE

緑の海に溺れて彼を見た。

BACK INTO ENGLISH

I saw him drowning in the green sea.

INTO JAPANESE

私は彼が緑の海に溺れているのを見ました。

BACK INTO ENGLISH

I saw him drowning in the green sea.