This time, he was successfully guided back to the Pacific Ocean using a "sound net" in which people in a flotilla of boats made unpleasant noises behind the whale by banging on steel pipes, a Japanese fishing technique known as "oikomi." Simultaneously, the attractive sounds of humpback whales preparing to feed were broadcast from a boat headed towards the open ocean. Researchers Louis Herman and Bernie Krause led a team of scientists who used sound recordings of natural whale feeding vocalizations to guide Humphrey back to safety. These sounds were produced for a swimming trajectory of fifty miles (80 km) until Humphrey reached the Pacific Ocean sometimes attaining speeds of thirty miles per hour (48 km/h).[6] Humphrey has been seen only once since the second misadventure, at the Farallon Islands in 1991. A film “Humphrey the Lost Whale” was produced and opened at the Tybee Island Marine Science Center, Savannah, Georgia on September 24, 2005.