North Korea's ”obstacles on the inter-Korean land route” have ”no military utility” - South Korean military

Regarding North Korea's installation of obstacles after blowing up the land routes of the Gyeongui Line and Donghae Line, the South Korean military said that they "have no military utility."
On the 4th, South Korea's Joint Chiefs of Staff said, "The North Korean military deployed a large number of troops and heavy equipment to the inter-Korean roads connecting the Gyeongui Line and the East Sea Line, and continued work until the 2nd of this month."
"As a result, an anti-tank trench measuring 120 to 160 metres wide, 10 metres long and 3 to 5 metres deep was built out of concrete where the existing railway and road used to be," he revealed.
An "anti-tank trench" is a hole or trench dug to block the operation of tanks. A Joint Chiefs of Staff official said, "North Korea detonated a bomb on a section of the South-North road connecting the Gyeongui Line and the East Sea Line on the 15th of last month.
"After the destruction, it was confirmed that 300 to 400 personnel and heavy equipment such as excavators were deployed each day to work on the anti-tank trenches," the military said.
"As this was an activity, we maintained a state of alert and monitored North Korea's work," he explained. "North Korea's claim that it has completed the 'complete cut-off of inter-Korean ties' is just a pretense (puff).
"We believe that this is a construction project for the purpose of performance," he said, "North Korea can fill the anti-tank trenches with earth and create an infiltration route to the South in a short time." He also emphasized that "it has no military utility."