Yesterday I read on Lou Netizen's blog that she had discovered new Linden Mole activity on the mainland. Specifically, the moles have in-progress builds on three sims: Celebes, Bohol, and Baltic in the newly-renamed Sea of Fables. Celebes and Bohol, which until recently were empty of everything except trees, have what looks to be a Greek village.
Lou, who is not a member of what my friend Melissa Yeuxdoux calls Second Life's landed gentry, has a history with Celebes and Boloh. Read here for her excellent blog post about that history.
Lou, sleuth that she is, discovered the prims she was unable to account for on Baltic had been used for a sim-wide underwater labyrinth.
The above link will take you to the ocean floor just a few meters from an opening that will drop you to the start of the labyrinth. If you fly above the water and set draw distance to 200 meters, you'll see the Greek Village-- or you can just fly north from the opening.