Similar technologies the US is forced to use in connection with the real threat of a nuclear attack from Pyongyang, who two days earlier conducted another test in the Pacific Ocean. The report says that it was this 50th state since the time of the "cold" war with the USSR was of strategic importance, it once housed the US nuclear warheads.
First, alarm sirens were tested, and then a special device was tested that could record the earthquakes at a great distance, the signal of which followed the warning of a nuclear attack.
As reported in the "URA-Inform", the United States recently threatened that in case of war the DPRK regime will be completely destroyed.