from a submarine. now, they also claim that about five years ago, but experts doubt it, that that was the case in the past. they have fired them from under water platforms or barges to make it easier. so certainly this was fired from a submarine, that is a significant move forward in their capabilities. very difficult to know for sure, though, from those images that north korea has shared. but what we've seen over the past couple of months, isa, is that they are testing new weapons. we have seen or at least north korea has said they have tested a hypersonic missile, some long-range cruise missiles, antiaircraft weapons, the sort of weaponry they have been showcasing and unveiling in military parades. that's the key there. what they show at the military parades, experts and intelligence agencies know eventually they will want to test to make sure that they work, to show the world that they have that capability and, of course, to give them leverage