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Tap the Sunken Temple. You'll know that it's available for opening Treasure Chests when you see the chest floating above the Temple.
Every eight hours, you'll be able to open a Treasure Chest for Free! After selecting, you will be presented with locked Chests to select from. Pick one and see what you’ve won!
Note: After you have used your first Free Dive, you will be charged Coins. The price will increase incrementally with each new dive you make.
Succeeding dives will always charge you where you left off during the last dive that day. The coin price will refresh every 24 hours.
If you want to see what the possible remaining prizes are, tap on the Prizes? button in the lower right corner of the screen.
After spending coins, you'll reach a point where you will need to use Gems to continuing searching the current selection of chests. The Gem cost will also increase with each dive.
Or you can wait eight hours and come back when it's free to do the Temple Dive again.
The Secret Chamber opens by using a Treasure Key, which also allows you to open a chest. Each additional chest requires a Treasure Key to open it.
To obtain Treasure keys, you can:
Gems are very valuable and the Crystal Cavern offers you the biggest chance to get them in the game. You have a choice of 5 Sunken Chests to open.
And other than Gems, you can win all these other prizes: