There are approximately 200 species of fish around the world that live in caves. Until recently, scientists believed that no cave fish lived in Europe. But in 2015, a diver exploring an underground cave in southern Germany saw a strange fish. He photographed it to show scientists. This new species of fish is called the cave loach. It is pink and has no scales. Since then, divers have found more than 150 cave loaches. But divers can only access a small part of the 97-square-mile (250-sq-km) cave. Scientists believe there could be even more cave loaches in the rest of the cave.