Stone age wall found at bottom of Baltic Sea ‘may be Europe’s oldest megastructure’

Structure stretches for almost a kilometre off coast of Germany and may have once stood by a lake

A stone age wall discovered beneath the waves off Germany's Baltic coast may be the oldest known megastructure built by humans in Europe, researchers say.

The wall, which stretches for nearly a kilometre along the seafloor in the Bay of Mecklenburg, was spotted by accident when scientists operated a multibeam sonar system from a research vessel on a student trip about 10km (six miles) offshore.