FILE - A scuba diver measures the length of Sac Aktun underwater cave system as part of the Gran Acuifero Maya Project near Tulum, in Quintana Roo state, Mexico, Jan. 24, 2014. Herbert Mayrl/Courtesy Gran Acuifero Maya Project (GAM) handout. _________________________________________________________________________________________________________________________________ MEXICO CITY — Items discovered underwater caverns in eastern Mexico to reveal what is believed to be the biggest flooded cave on the planet Archaeologists exploring the world's biggest flooded cave in Mexico have discovered ancient human remains at least 9,000 years old and the bones of animals who roamed the Earth during the last Ice Age. A group...
