Seok-won Lee, chairman of the Korean Tunneling and Underground Space Association say “it is regrettable that tunnels and underground space are depicted mostly as darkness, hardship, adversity".

Tunnel experts in Korea believe this perception is slowly changing. People gradually have a different perspective of underground space. The most important advantage of the tunnel and underground space is the stability. Unlike the outside,the climate or temperature environment can be precisely adjusted in the underground space. Also there are no ultraviolet rays, electromagnetic waves etc.

Experts say underground space and tunnels must be promoted.