Divers have discovered a long-submerged wall some 7,000 years old under the sea off western France, scientists said Thursday.

Nearly 400 feet long, it was found off the Ile de Sein in Brittany along with a dozen smaller manmade structures from the same period.

"This is a very interesting discovery that opens up new prospects for underwater archaeology, helping us better understand how coastal societies were organized," Yvan Pailler, professor of archaeology at the University of Western Brittany, told AFP.

He co-authored a study on the find, published in the International Journal of Nautical Archaeology.

The structures were first spotted by retired geologist Yves Fouquet in 2017 on charts of the ocean floor produced with a laser system.

The wall is the biggest underwater construction

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