In this photo taken on Saturday, July 28, 2012, American journalist and diving instructor Steven Schwankert in diving suit swims inside the Blue Zoo aquarium in Beijing. A lifelong scuba diving obsession led Schwankert to the tale of the HMS Poseidon and the startling discovery that the British submarine, which sank off the northeastern coast of China in the 1930s, had been raised by the Chinese in 1972. That revelation lies at the heart of Schwankert's upcoming book, "The Real Poseidon Adventure: China's Secret Salvage of Britain's Lost Submarine" and an accompanying documentary film chronicling his search for answers about what became of the sunken vessel. (AP Photo/Andy Wong)

Associated Press
In this photo taken on Saturday, July 28, 2012, American journalist and diving instructor Steven Schwankert in diving suit swims inside the Blue Zoo aquarium in Beijing. A lifelong scuba diving obsession led Schwankert to the tale of the HMS Poseidon and the startling discovery that the British submarine, which sank off the northeastern coast of China in the 1930s, had been raised by the Chinese in 1972. That revelation lies at the heart of Schwankert's upcoming book, "The Real Poseidon Adventure: China's Secret Salvage of Britain's Lost Submarine" and an accompanying documentary film chronicling his search for answers about what became of the sunken vessel. (AP Photo/Andy Wong)
In this photo taken on Saturday, July 28, 2012, American journalist and diving instructor Steven Schwankert in diving suit swims inside the Blue Zoo aquarium in Beijing. A lifelong scuba diving obsession led Schwankert to the tale of the HMS Poseidon and the startling discovery that the British submarine, which sank off the northeastern coast of China in the 1930s, had been raised by the Chinese in 1972. That revelation lies at the heart of Schwankert's upcoming book, "The Real Poseidon Adventure: China's Secret Salvage of Britain's Lost Submarine" and an accompanying documentary film chronicling his search for answers about what became of the sunken vessel. (AP Photo/Andy Wong)
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