A three dimensional submarine cake is a striking cake design perfect for a naval officer, child who likes submarines, or for a Beatles-themed event. It is impossible to cook a 3D submarine design unless you have a cake mould, which can be hard to find. The easiest way to make a 3D sub design is to bake two loaf shaped cakes and a round cake and then sculpt the cake into the desired shape after baking the cakes.
Spray the pans with cooking spray, and heat the oven to 162 degrees C. Fill the pans two-thirds full with the batter, then place them in the oven and cook for 20 minutes. The round pan will cook the fastest, so pay attention to it. The loaf pans will take between 30 and 40 minutes. Remove the cake from the oven when the centre is spongy and the cake pulls away from the sides of the pan.
Allow the cake to cool for 15 minutes, then turn out of the pans and freeze for two hours.
Place the cakes on a cake tray, and cut off any part of the cake that is uneven. The top and bottom should be completely level.
Arrange the two loafs end to end on the cake tray. Frost the cakes with butter cream icing to crumb coat.
Cut two long pieces from the middle of the round cake and layer them against the long sides of the loaf pieces to create a curved shape. Stack two, 3-inch wide semicircles on top of each other and place against one end of the loafs for a rudder.
Cut two, 5-inch long, 4-inch wide ovals from the round cake and place them on the top of the loaves on the end opposite from the rudder. Place the cake pieces about 6 to 8 inches from the edge. Stick a bamboo skewer through the cake tower and through the loaf base to stabilise the top.
Frost the remaining pieces of cake. Decorate the cake as desired, with fondant, more butter cream icing, or any other desired decorations.