The United States Navy implemented a program in 1960 to work with dolphins and sea lions in order to help with defense, mine detection, and the design of new submarines and new underwater weapons. The Navy did many tests with several marine mammals to determine which would be best for the jobs they needed done, with "more than 19 species...including some sharks and birds" tested, though the bottlenose dolphin and California sea lion were considered the best at what the Navy needed them for. The bottlenose dolphins' asset was their highly evolved biosonar, helping to find underwater mines, and the sea lions' asset was their impeccable underwater vision, which can help to detect enemy swimmers. In fiscal year 2007, the United States Navy spent $14 million on research on marine mammals as weapons and marine mammal training programs in object recovery and mine detection and have 75 trained dolphins. Dolphins have contributed to saving more lives in open water than specially trained life savers.