Final Quest

You look around the room, and eventually find a blue dragon scale hidden in one of the corners.
The three of you gather together at the water, where you can make out the shape of a blue dragon. "I guess one of us has to get in there and find a place for that scale to go," you say.
"Well, don't look at *me*," Alasse replies. "I won't be able to see well under there."
"I *really* don't like water," the green dragon comments.
"I guess it's up to me," you sigh, silently adding, -As usual.- You remove your weapons and shoes, and gingerly slide into the water, ready to get out again if something seems wrong.
The water is freezing, and you let out a slight gasp. You move around a little in order to get a bit warm, then, taking a deep breath, you slip under the water, opening your eyes as you do so.
Underwater, everything looks strange. And it feels so silent, like you're in another world. But there's no time to wonder about it. You can only hold your breath for so long, so you only have one chance to get this right.
What area are you going to search for the spot where the scale has to go?