The TV series 'Game of Thrones' claims a 700' high ice wall. Game of Thrones uses significant amounts of CGI, so the only place this ice wall exists is inside a computer. Nevertheless, could a real ice wall of its dimensions be built and stand? In various scenes, the ice wall is essentially vertical. I haven't seen the more-or-less vertical ice walls created by 'calving' glaciers personally, so I don't know whether any of them attain 700' in height. However, unlike those glacier ice walls, the Game of Thrones ice wall is 2-sided, and is warmer on one side -- enough to 'weep' under the sun. Sooooo... Based on standard Earth gravity and standard water ice, is a 700' ice wall possible? Note that the GoT ice wall is flat, so it doesn't gain any stability from being curved, and as a result, could probably not stand up to the high winds that its mere presence would generate. Ice is only a tad lighter than water, and 700' is approx. 22x the 32' of water that equals 1 atmosphere. I don't think that WWII *steel* submarines could withstand 700' depths of water, so the pressure at the bottom of such a wall would be quite high and would likely require some reinforcement.