First half of the Sun Temple
Once you get into the temple feel free to explore, you will find a dark area blocking you from half the temple. Also you will find a room in upper right corner that has a blue Crystal on a wood platform. Sing the bind song and you will be pulling the crystal. Pull it over the passage on the left that goes down, it won’t go down with you, but that’s ok. Once positioned above the passage swim down and go to the big room above the dark room and spin to turn the stopped gear (spin by pressing R) this will bring the water level down and the crystal will come down with the water. drag the crystal below the other passage and raise the water again, that will take to an other room keep doing this until you get the crystal to the far left room with no ceiling, then drag the crystal into the light it will fall off the platform and the crystal will fall off the plat form and light up. Now drag the crystal to the dark zone for light.
There is a wall that you can swim though to get a treasure, it’s in the room under the room were you first find the crystal, its on the right wall towards the top.