Explorers discovered the odd-shaped object on the ocean bed of the Baltic Sea in June 2011. Dubbed the Baltic Sea Anomaly, the object is a 70-metre long (210 feet) strangely-shaped feature that showed up on sonar laying 100 metres (300 feet) beneath the waves. Theories as to what the Anomaly could be have ranged from the interesting to the outrageous, with some claiming it could be part of fleet of crashed UFOs on ocean floor.
Others have claimed it could be the remains of a sunken city lost to the waves years ago.
However ... Read even more
