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You can't drain the water, but you can dive down to it and put on the iron boots. Then you can just get the key underwater.
You go to the room above it. There's a part in the water in that room to blow up, but not in the room with the boss key.
no u use a boss key
it's where the spin thing is The boss key is in the room where there is water under u. U will see the chest with windmill like things around it and a wooden gate. Look on the ground to see a pathway. Use the gale boomerang and blow the windmills in the exact order of the path to open the gate and get the boss key.
The boss key can be acquired in several different ways but usually you will acquire it in a chest. If not this method then you usually must defeat a mini boss.
In certain parts of the dungoen there will be rooms with goron elders inside, talk to them and they will give you boss key shards. talk to all three elders to complete the boss key
If you want to find the BOSS for the Lakebed Temple on Twilight Princess, you have to get the BIG KEY and then go to the room with the giant swiveling staircase, and just jump into the water. The BOSS DOOR is level with the water surface under the swiveling staircase. This BOSS is the coolest one so far. -Caveman1593
you have to blow to enter and for boss you have to get boss key
john key
john key lol
When you are about to go to the third floor instead of going there go straight. You will fight a dragon. There in a cage is the boss key.
The water temple's boss is Morphia, an eye with tentacles made of water.