An algal bloom? A mine? A UFO? No one knows. But it is clear that Swedish treasure hunters have found a giant circle on the Baltic seabed. The bay was a mirror in the morning on June 19. Six of the nine crew members aboard the fishing vessel lake was still asleep in their bunks. Barely awake sat the remaining three, staring at the screen that shows what is hidden on the seabed. Read more (Swedish)