Yes,she is a Geobuksean,a Turtleship from South Korea. The spikes on the roof were actually 2ft in length and were usually hidden by straw mats,a nasty surprise for the Japanese who generally attacked by boarding. These early ironclad battleships were armed with three different grades of cannon,light:-range of 200yds; medium:- range of 400 yds and heavy:- range of 600yds. Not only did these guns fire cannonballs,but a special kind of ammo called an iron arrow. This could be from 3ft to 9ft in length and were constructed of a wooden shaft with an iron tip and iron wings,which were designed to puncture large holes in the hulls of enemy ships. Top speed was around 6-8kts and in this form,was the brainchild of the worlds most successful Admiral,who in 23 naval engagements never lost a battle,Admiral Yi Sun-sin.