This documentary doesn't actually find Atlantis but does find an island that may have been inhabited and have been over glorified over the ages. They also uncover a lost city that is underwater now, based on the stone foundations of the buildings and human habitation debris lying around. Note: The possibility that Yogaguni (underwater structure in Japan) may have been shaped to some extent like a couple of sites in South America or like the Sphinx is not explored. I.e. the Sphinx was carved out of the limestone bed rock and not made by blocks of stone.
National Geographic: Legend of Atlantis (Full Episode) | Drain the Oceans - Exciting evidence emerges of civilizations lost for centuries under the waves, from mysterious underwater pyramids off the coast of Japan to the fabled city of Atlantis itself. Using cutting-edge graphics to reveal what's actually lying on the seafloor, and insight from the world's top marine archaeologists, Drain the Oceans finds the answers.