“In the very depths of the Blautopf (“blue pot”) once sat an aquarian maiden with long flowing hair”, wrote Eduard Mörike. Like a massive barrel of blue ink, the Blautopf is located in the Swabian Alb near Ulm. It is known today that limestone particles solubilized in the water scatter and reflect the light at different strengths. But the bottom of the spring of the karst once held a secret: in the 1980s, divers, among them Jochen Hasenmeyer, discovered a passage 1.40 meters in width, at a depth of approximately 20 meters. This tunnel led to a gigantic system of caverns. They aptly named the caverns “Mörikedom” – Mörike’s Cathedral. To this day, the true magnitude of the Blautopf-caverns remains unknown. Latest research estimates their total length to be 14,600 meters. Who knows – perhaps Mörike’s mermaid resides here after all?