A top-secret submarine prototype has been identified on Google Maps images by sharp-eyed users who spotted its futuristic design and quickly spread the word, the New York Post reported. Photos showing the "Manta Ray" autonomous vessel apparently docked at Port Hueneme naval base in California went viral Sunday as military and aeronautical buffs gawked at the rare glimpses. The submarine is named after the marine creature due to its physical similarity and ability to lurk for extended periods deep underwater. The "Manta Ray" aquatic defense vessel was spotted docked at Port Hueneme on Google Maps. The brainchild of Northrop Grumman, the vessel is part of a wider U.S. Navy project to augment the nation's long-range underwater fleet of unmanned vehicles.