Ott Zelda help

I am satuck in the Water temple.
i am in the room with whirling water, a dragonstatue in the water.
I cant figure out what to do in there.
I only need a bosskey, and i can come to the boss.

I d'unt need a key to come to anyone.

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Hmmm, if you've done everything else, then there should be a crystal or something to open a gate somewhere in that room, then you just swim down and get a key. The boss key is in a totally different room, but there should be one which leads to that place....

Im so confused. 😑