North Korea is building its largest-ever warship ever — possibly more than double the size of anything in its existing fleet.

North Korea may be building its largest warship to date, new satellite imagery shows, after Pyongyang pledged to invest heavily in its navy as part of a wide-ranging military buildup. North Korea has forged ahead with myriad military programs, including bolstering its naval power, and has pressed for rapid upgrades to its shipyards.