Dive into the Depths with the Ethereal Headdress Inspired by the ancient, lost ocean of Tethys, this AR face filter evokes the mystery and beauty of underwater realms. Channel the spirit of an ocean that once covered vast stretches of the Earth 250 million years ago. About the Tethys Ocean: The Tethys Ocean is one of the most famous lost oceans, existing during the time of Pangea. Although long vanished, traces of it remain in the Mediterranean Sea and even in the towering peaks of the Himalayas.