'UFO-like' structure 'with stairs' discovered at the bottom of the Baltic Sea

Scientists believe they have finally established the truth behind one of the world’s greatest deep sea mysteries. Back in 2011, Swedish explorers Peter Lindberg and Denis Asberg were combing the Baltic Sea for treasure when their sonar radars detected a jaw-dropping structure. Lying nearly 300 feet (90 metres) beneath the waves, the object was circ…