Video: Building a floating city also known as an aircraft carrier is hard as hell to do because the numbers are basically unfathomable. A basic aircraft carrier is made of 60,000 tonnes of steel, 4.5 acres of non-skid surface with four 100m catapults. The whole thing weighs 90.7 million kilograms and takes five years to build and - get this - costs $US5 billion ($6.5 billion) at the very least. It's a massive undertaking. Science Channel gives a brief overview on the construction process of an aircraft carrier. It's like playing with LEGO bricks, if LEGO bricks weighed 816,466kg and you needed to weld 161 of them together. The video also covers the cool features an aircraft carrier has, like the arresting wire and the jet blast deflector. It's not quite enough info to build your own aircraft carrier. But hey, if you have $6.5 billion lying around, this video is a good start.