Well, the double hulls of these ships are inch-thick steel, but I think the dome is less protected. An attack that blew the dome off could open up a large hole

Well, the double hulls of these ships are inch-thick steel, but I think the dome is less protected. An attack that blew the dome off could open up a large hole and ignite the escaping gas, but it would still take minutes for all of it to boil off, probably freezing as it does. I guess a big enough rocket could blow the liquid out of the tank, or rupture a large hole in the hull of the ship causing the LNG to dump into the (relatively) warm water and boil off faster. But at some point the real question is: How did the bad guys fire rockets into a secured unloading station?