A team of explorers working off the western coast of Cuba say they have discovered what they think are the ruins of a submerged city built thousands of years ago. Researchers from ... Canadian company [Advanced Digital Communications] used sophisticated sonar equipment to find and film stone structures more than 2,000 feet (650 metres) below the sea's surface. The explorers first spotted the underwater city last year, when scanning equipment started to produce images of symmetrically organized stone structures reminiscent of an urban development. In July, the researchers returned to the site with an explorative robot device capable of highly advanced underwater filming work. The images the robot brought back confirmed the presence of huge, smooth blocks with the appearance of cut granite. They believe these formations could have been built more than 6,000 years ago, a date which precedes the great pyramids of Egypt by 1,500 years. It's a really wonderful structure which really looks like it could have been a large urban centre," ADC explorer Paulina Zelitsky told the Reuters news agency.
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