A World War I-era submarine has been discovered more than 108 years after it was lost at sea by researchers conducting a deep-sea training dive off the coast of San Diego, California. Footage captured by Bruce Strickrott using advanced deep-sea imaging technology from the Woods Hole Oceanographic Institution shows the USS F-1 sitting at the bottom of the ocean in California. The sub had not been seen since 1917, after it collided with another submarine during a training exercise, killing 19 crew