A walker shares a photo of a strange Baltic Sea find – beach discovery raises a mystery. The online community is puzzling: Is it a turtle, a spaceship or something completely different? The Baltic Sea offers a variety of discoveries and not every stone is the same.
Despite the humorous sideshows, all members take part in solving the mystery. It is a “fossil sea urchin” - more precisely, the stone core with shell remains from the underside. The answer can ultimately be found in the numerous comments.