You completed the Mystery of the Deep Collection!

The greatest naval power of antiquity is said to have vanished in a single day and night; but not before the Atlanteans' obsession with the sea led them to adapt a few of their own to thrive in the deep. These aquatic Atlanteans are all that now remain of the island nation, and they jealously guard its sunken secrets. Congratulations on uncovering the Mystery of the Deep! Enjoy your "Plato Was Right, As Usual" card -- assuming you can escape with it back to the surface...