YOU SAID:
No jumping in the sewer
INTO JAPANESE
下水道に飛び込むことはありません
BACK INTO ENGLISH
You do not jump into sewers
INTO JAPANESE
あなたは下水道には出ない
BACK INTO ENGLISH
You will not enter the sewer system
INTO JAPANESE
あなたは下水道システムに入らない
BACK INTO ENGLISH
You will not enter the sewer system
That didn't even make that much sense in English.