A student prays as he observes a moment of silence for the victims of the March 11, 2011 earthquake and tsunami during an earthquake simulation exercise at an elementary school in Tokyo

A student prays as he observes a moment of silence for the victims of the March 11, 2011 earthquake and tsunami during an earthquake simulation exercise at an elementary school in Tokyo

A student prays as he observes a moment of silence for the victims of the March 11, 2011 earthquake and tsunami during an earthquake simulation exercise at an elementary school in Tokyo, Japan March 10, 2017, a day before the six-year anniversary of the March 11, 2011 earthquake and tsunami disaster that killed thousands and set off a nuclear crisis. Reuters/Issei Kato

March 11, 2017 10:17 AM (UTC+8)