Have you found the first tablet? I guess you are stuck at the door with a 4-way switch, where you have to hit it on the 4-sides in a secret order. Well, if you swim around the statue in the middle of the main room, you will find an tablet. Read it. To read the hands, you have to swim through the palms and get the silver rupee, the hand will close and you get to see what's written behind it (more like in the fist than behind the hands, but whatever). You will find some kind of flower with only one petal blue, the blue petal is the associated direction to hit the switch. The tablet says what is the order to look at, example back then right hand, go to the back of the statue, see what is the petal, then go to the right hand and see it too. It's difficult to explain, really easy to figure out once you find the tablet.