The unmanned weapon called Haeil-2 is being tested just over a week after the country unveiled the Haeil-1 underwater system, which translates to tsunami in Korean. It is designed to make sneak attacks in enemy waters.
During tests of the strategic underwater system from April 4 to 7, state media KCNA stated that the drone traveled a distance of 1,000 km for 71 hours and 6 minutes and successfully hit a simulated target.
North Korea has increased its military activity in recent weeks in protest against the United States and South Korea conducting joint military exercises.