Artificial Gills. Professor Edward Cussler 's long-held dream is to breathe like a fish. Back in 1980 he built an artificial gill that extracted oxygen from water. But on testing the device, it failed to provide enough oxygen to support him. But he has not abandoned his dream and, increasingly, he is being joined by a band of fellow thinkers. Scientists are looking into ways to improve on Cussler's experiment. Quentin Cooper talks to some of the researchers who believe that, in the future, artificial gills could be used by people working on submarines, or even underwater hotels. Producer Colin Grant