The Hidden City - The Journey to the bottom of the ocean.Scientists have discovered hidden underwater traces of a city that existed at Alexandria at least seven centuries before Alexander the Great arrived. Amazing , isn't it.
7 underwater wonders of the world: Bay of Cambay, India A few years ago in India, was opened a city of thousand years old. These underwater ruins at the southern coast of India showed the highest level of civilization at that time.
Jason de Caires Taylor’s underwater sculpture garden in Cancun. "Constructed out of concrete and steel, and bolted to the ocean substrate, the works here act as artificial reefs that provide “an ideal habitat for filter feeding organisms.