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Atlanta aquarium has a lot to see. It has more than six million gallons of saltwater. With 4,574 square feet of viewing windows, a 100-foot-long underwater tunnel, 185 tons of acrylic windows and the second largest viewing window in the world at 23 feet tall by 61 feet wide and 2 feet thick,
I can only guess at the thickness of that glass wall, considering it's size and the tons of water pressure behind it.
-Nik