Question: why was the sword of gryffindor at the bottom of the lake?
Answer: Originally Answered: In Harry Potter, why did Snape put the Sword of Gryffindor at the bottom of a frozen lake, as opposed to making it easy for Harry/Ron to get it? because retriving the sword required the act of chivalry. hence the sword was kept at the bottom óf the lake for harry to retrive.