Keh Namut Shrine
Once complete, this Shrine will grant you the Cryonis rune for your Sheikah Slate. Cryonis lets you create ice blocks out of water, which you can then climb. You can even create multiple ice blocks, letting you create your own stepping stones. Swimming is quite the chore in this game so Cryonis is a welcomed addition.
Press the L shoulder button to pick out where you want to create your ice block. Press [A] to make your block and use it to climb up to the next platform.
As you go forward you will be stopped by a gate above another body of water. Look carefully and you will see there is a gap between the gate and the water. Create an ice block right underneath it to lift the gate up, and walk under the gate to continue. You will be stopped by another Guardian Scout. As with before, it doesn't have much health and only has one attack.
Once you've made your way down the hallway, look to your left to see the telltale glow of a treasure chest. Use Cryonis to make a block and then climb up it to get to the platform. The treasure chest will give you a Traveler's Spear.
The next chamber of this shrine has what looks like a see-saw. To scale the wall, you will need to use Cryonis to make an ice block that will lift up the plank. So make an ice block and put it under the left or right side of the plank. You will then be able to walk up it like no big deal!
Make your way to the right and you will meet with the Keh Namut monk and claim your final Spirit Orb.