YOU SAID:

There's a big gate thing in the sea ahead.

INTO JAPANESE

前方の海に大きな門のようなものがあります。

BACK INTO ENGLISH

Up ahead in the sea there is something like a large gate.

INTO JAPANESE

先の海に大きな門のようなものがあります。

BACK INTO ENGLISH

There is something like a large gate in the sea ahead.

INTO JAPANESE

前方の海に大きな門のようなものがあります。

BACK INTO ENGLISH

Up ahead in the sea there is something like a large gate.

INTO JAPANESE

先の海に大きな門のようなものがあります。

BACK INTO ENGLISH

There is something like a large gate in the sea ahead.