To get another chest, in the same locked room as the Monk, prepare before hand. With this in mind, set up three ice blocks using the Cryonis Rune, (making sure not to block the laser from the switch on the other side of the room). However, if you try crossing, you’ll find that the door to the Monk is sealed from a pressure plate that is underwater. When you’re ready, start pushing the lever to raise the water level.
Down on a lower platform before the water rises you can find a chest holding an Opal. Note: Before continuing on, make sure to drop down the platform to the right of the entrance. There’s also a lever to your left you can push in either direction - this will cause the laser to rotate around the room, hitting a switch on the far side at the end of its rotation that will trigger the water to rise or fall.
The Sheh Rata Shrine features a lot of interesting parts, as you’ll enter to find a laser beam firing in front of you, high above a flooded area down the stairs from your position.
