Plougastel, a small village in France’s Brittany region, is offering a prize of €2,000 ($2,250) to whoever can decipher a 230-year-old inscription carved into a nearby rock-slab.

Discovered just a few years ago, the mysterious rock is located in a cove accessible only at low tide. It features 20 lines of writing in a “language” that so far no one has been able to crack, two years  – 1786 and 1787 – as well as carved images of a ship with sails and rudder, and a sacred heart. Local academics have been struggling to decipher the centuries-old images for some time now, but so far all they’ve come up with is theories. Some believe that the writing may be in old Breton or Basque, while others think that whoever carved it into the rock slab may have been semi-illiterate.

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