The South Korean military is reportedly developing ultra high-speed anti-ship missiles, in response to other countries beefing up their naval powers and maritime presence.
According to Yonhap News Agency, the new missiles will fly at maximum speeds of Mach 3, or approximately one-kilometer a second, for more than 300 kilometers.
The project is expected to finished in 2020.
It seems North Korea is also developing its high-speed anti-ship missiles, most likely in response to the increasing U.S. naval presence in Korean waters.
Experts say Japan, Russia and China are also developing their own supersonic anti-ship missiles.