This looks pretty huge already but it's just one of five pieces that'll make up the finished result.
HMS Queen Elizabeth's one of two new aircraft carriers being built for the Royal Navy and it'll take eight years to complete.
Aircraft carriers like this are used to carry aid to foreign countries and to transport troops and planes to wars.
The process is a bit like putting together a massive puzzle as different parts are being built all over the UK.
It's not gone completely smoothly for the government though.
The price of the carriers has gone up a lot since they first decided to build them - and some say that money's been wasted through indecisions along the way.
Joe went along to Portsmouth on the south coast to see how you go about building such a massive ship.