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TOKYO, JAPAN - SEPTEMBER 03:  Pedestrians watch a monitor showing a news program reporting on North Korea's 6th nuclear test on September 3, 2017 in Tokyo, Japan. South Korea, Japan and the U.S. detected an artificial earthquake from Kilju, northern Hamgyong Province of North Korea. State news agency KCNA announced Pyongyang have successfully carried out a test of a hydrogen bomb, which could be loaded to the Intercontinental Ballistic Missile (ICBM) missile. (Photo by Tomohiro Ohsumi/Getty Images)
TOKYO, JAPAN - SEPTEMBER 03:  Pedestrians watch a monitor showing a news program reporting on North Korea's 6th nuclear test on September 3, 2017 in Tokyo, Japan. South Korea, Japan and the U.S. detected an artificial earthquake from Kilju, northern Hamgyong Province of North Korea. State news agency KCNA announced Pyongyang have successfully carried out a test of a hydrogen bomb, which could be loaded to the Intercontinental Ballistic Missile (ICBM) missile. (Photo by Tomohiro Ohsumi/Getty Images)

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Some Japanese preparing for nuclear attack

A growing number of Japanese residents are making preparations for a possible nuclear attack by North Korea. CNN's Kyung Lah takes a look at Japan's increasing demand for bomb shelters in the event of a national disaster.

Some Japanese preparing for nuclear attack

A growing number of Japanese residents are making preparations for a possible nuclear attack by North Korea. CNN's Kyung Lah takes a look at Japan's increasing demand for bomb shelters in the event of a national disaster.