For South Korea, it's still all quiet on the northern front.

Friday was a day of particular tension on the Korean peninsula, as U.S. Secretary of State John Kerry arrived in Seoul, and as the South Korean government awaited signs of an expected missile launch by its northern neighbor.

But in the Demilitarized Zone, the four-kilometer strip of no man's land that separates the two Koreas, you would be hard-pressed to find any signs of tension.

As in Seoul and the rest of South Korea, the past week in the DMZ has felt to many people no different than any other. So much so that regular tours of the DMZ -- organized by United States Organizations, which provides services to U.S. troops overseas -- went on, uninterrupted in recent days.

Mr. Ponnusamy, a history buff who has long wanted to visit the DMZ, figures that the recent North Korean saber-rattling is all just bluster.