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Too much sunlight can damage the algae that live inside coral in shallow water. To protect the algae, which are a main source of sustenance for the coral, the corals fluoresce. This creates proteins that act as a sort of sunscreen for the algae.

The biggest ocean waves are not the ones that you can see from the shoreline. As physical oceanographer Kim Martini told Deep Sea News, the largest waves that occur in the ocean are called internal waves, which take place between two fluids with two different densities. As these internal waves travel—for thousands of miles, no less—they can grow to be 650 feet tall.

Not to take anything away from the gorgeous Grand Canyon on Earth, but the Zhemchug Canyon, located in the Bering Sea, has a vertical relief of 8,520 feet—almost 2,500 feet deeper than the Grand Canyon.