YOU SAID:
hello i am under the water
INTO JAPANESE
こんにちは、私は水の下にいます
BACK INTO ENGLISH
Hello, I'm under water
INTO JAPANESE
こんにちは、私は水中にいます
BACK INTO ENGLISH
Hello, I am in the water
INTO JAPANESE
こんにちは、私は水の中にいます
BACK INTO ENGLISH
Hello, I am in the water
That didn't even make that much sense in English.