The arrival of HMS Queen Elizabeth has been the military story of the year in Britain - and this week was an important landmark, the moment it formally joined the Royal Navy.
The new aircraft carrier, along with its sister vessel HMS Prince of Wales, is meant to spearhead a new generation of British hard power. Business Insider was invited on board to learn more about the event - read on to find out what we saw.
This week was one of the biggest of the whole year for the Royal Navy -- it's biggest and most expensive ever ship formally joined the fleet.
HMS Queen Elizabeth set sail for the first time earlier this year, but had to undergo tests at sea before becoming an official part of the navy.
And this Thursday was the day when the ship was "commissioned" in a ceremony starring Queen Elizabeth II.
As part of the celebrations around the carrier, Business Insider was invited on board to see some of the preparation, and talk to a few crew members -- here's what happened.
Nobody gets into the Queen Elizabeth's new home, Her Majesty's Naval Base, Portsmouth, without an invitation and security check.
We were invited, so after hanging out with some other media at Unicorn Gate - one of a few tightly-controlled entrance points - we made our way in.
HMNB Portsmouth is huge, and houses much more than the Queen Elizabeth, so we took a ride past some other naval hardware to get inside.
Then we had another layer of security -- more checks and two locked doors -- to get to the part of the dock housing the carrier itself.
There were Royal Marines outside on patrol with automatic rifles and live ammunition.
We were led on board up a narrow metal gangway, while the naval officer leading us received salutes from the sailors we passed.
We went down a floor from where we entered to the aircraft hangar -- which in future will hold dozens of fighter jets and helicopters ready for operations.
But when we visited the hangar was not yet full of F-35 stealth fighters (which are due to start arriving from the US soon), but was a temporary auditorium for the commissioning ceremony.
The hangar is on top of the magazine, a huge compartment of the carrier full of bombs and other munitions which can be automatically brought into the hangar to "weaponise" (load up) the aircraft.
The Queen Elizabeth's munitions loading systems are automated, which makes the process of equipping aircraft a lot faster than in previous carriers.
While we were there the captain of the ship swung by to say hello.
Jerry Kyd spoke to Business Insider about the ceremony ahead. But also about working with the US Navy, putting the ship through her paces, and a future for drone technology on board.
Watch some more of our interview to hear what he said.
Then we saw sailors file in to practice drill ahead of the big commissioning ceremony.
Here they are in formation.
Senior non-commissioned officers yelled instructions while the junior sailors snapped to attention and practiced cheering for the Queen.
Then we went further into the ship, to the galley (kitchen), where chefs were getting ready to feed the Queen on her visit two days later.
HMS Queen Elizabeth has five galleys overall, and can comfortably provide 1,500 people with three meals a day.
We spoke to their boss, Petty Officer Dean Allen, about what's on the menu for Her Majesty -- which he choose with a little help from Buckingham Palace.
You can read the full details of the Queen's menu here with more details from our conversation with PO Allen.
We also got to speak to the youngest crewman on board, Able Seaman Callum Hui, who told us about what it's like to be 17 on board an aircraft carrier.
AB Hui told us there are lots of pluses. It's an exciting job straight out of A Levels, there's a lot of camaraderie, and, in Hui's case, you get to meet the Queen.
But he did say that when you're at sea for weeks on end, it can be tough getting by with no internet connection - and no social media.
Here's AB Hui cutting the ceremonial cake during the commissioning ceremony -- a job traditionally given to the youngest crewman on board.
We'd already overrun by that time, so it was time to head back up into the hangar and be on our way out -- guttingly without the chance to see the flight deck.
But Pete Sandeman from Save The Royal Navy did get that part of the tour, and shared some photos with us.
Here's the rear of the two "islands," which will be used to coordinate aircraft (the front one is for steering the ship).
Above the door is written the Latin motto of the Aircraft Handling branch of the Royal Navy: Nostris In Manibus Tuti.
It translates to: "Safe in our hands."