effort to save the whale, Dr.Louis Herman, a researcher of dolphins and humpback whales, postulated that it would be possible to lure it out by playing acoustic recordings of whale social and feeding sounds. Dr. Diana Reiss, a dolphin researcher and a member of the rescue team was appointed to head the playback operation. The actual recordings used were of Humpback whales feeding in Alaskan waters and were obtained from Dr. Scott Baker. Bernie Krause, an acoustician, offered to loop the recordings of humpback whale feeding songs. 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. Pless and his colleague Dale Galarowicz quickly gained Navy permission and rushed the equipment to Rio Vista where Humphrey was last seen. Early the next morning, the equipment was loaded onto the private yacht, Boot Legger, donated by its owner for the rescue effort. Directed to the location in the slough where Humphrey was last seen, the speaker was lowered over the side of the boat, the sounds were played, and Humphrey emerged from the water at the bow of the ship. The captain quickly started down the river with Humphrey close in tow. With the assistance of numerous fish and wildlife agencies, including the Army's 481st Transportation Company (Heavy Boat), the crew led him the many miles back down the Sacramento river, alternately playing and not playing the whale songs to keep his interest. Large numbers of spectators lined the banks of the river. As they approached the San Francisco Bay and the water gained in salinity, Humphrey became visibly excited and began sounding. Though the crew lost sight of him that night, they picked him back up in the morning and led him out through the Golden Gate bridge into the Pacific Ocean on November 4, 1985, at 4:36 p.m. The town of Rio Vista later erected a commemorative granite marker at City Hall at the east end of Main Street. A restaurant in Antioch was named Humphrey's in the whale's honor. The restaurant has since been remodeled and its name changed to 'Smith's Landing Seafood Grill'. 1990 Humphrey stayed a considerable time