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A visitor looks at the North Korean side from the unification observatory in Paju, South Korea, Thursday, Oct. 31, 2024. (AP Photo/Lee Jin-man)

A visitor looks at the North Korean side from the unification observatory in Paju, South Korea, Thursday, Oct. 31, 2024. (AP Photo/Lee Jin-man)

This satellite image from Planet Labs PBC shows digging along a road in the Demilitarized zone between North and South Korea on Wednesday, Oct. 30, 2024. (Planet Labs PBC via AP)

This satellite image from Planet Labs PBC shows digging along a road in the Demilitarized zone between North and South Korea on Wednesday, Oct. 30, 2024. (Planet Labs PBC via AP)

This satellite image from Planet Labs PBC shows digging along a road in the Demilitarized zone between North and South Korea on Tuesday, Oct. 29, 2024. (Planet Labs PBC via AP)

This satellite image from Planet Labs PBC shows digging along a road in the Demilitarized zone between North and South Korea on Tuesday, Oct. 29, 2024. (Planet Labs PBC via AP)