The doctor of a man with severe amnesia said staff "were no closer to his identity" and were still appealing for information from anyone who might know he who is.
Dr Manaan Kar Ray told Good Morning Britain "Robert", as doctors are calling him, is "very keen, if anyone knows him, that they might be able to help him piece his life together."
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The British territory of St Helena is in the South Atlantic, and the government has warned swimmers to enter the sea at their own risk.
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Tony Kim, who taught accounting at Pyongyang University of Science and Technology, was detained as he tried to leave the country.