Four years after the tsunami hit the north-east coast of Japan killing thousands of people, Yasuo Takamatsu is still searching for his wife’s remains. He has even learned to dive in his quest to find her. Yoko Takamatsu worked for a bank and was in her office when the wave struck. Her husband Yasuo and the couple’s two children survived, while Yoko is presumed to have died. Yasuo told Outlook’s reporter Hiromi Tanoue about the events of that terrible day, 11 March 2011.