As a last-ditch effort to save the whale, Louis Herman, a researcher of humpback whales, postulated that it would be possible to lure it out by playing acoustic recordings of vocalization of a whales feeding ground. Dr. Bernie Krause, an acoustician, offered the recordings he had made of humpback whale feeding songs as a possible way to lure him out. No one knew if this would work, but it was their last shot at saving Humphrey. However, to get the sounds into the water required a powerful speaker and amplification system that only the Navy was likely to have. Krause contacted Greg Pless who was in charge of the underwater acoustics research laboratory for the Naval Postgraduate School in Monterey, California, where one of the few high-power J-11 underwater transducers existed in the country. Greg and his colleague Dale Galarowicz quickly gained Navy permission and rushed the equipment to Rio Vista, CA where Humphrey was last seen.