So on board Ark Royal are about 130 Royal Marines. They can get to land - if they need to - by helicopter, or directly by ship.
I met a few of them training on the flight deck. Firing their guns at targets placed at the end of the ship. Whenever another vessel passed behind us they had to stop. It's not easy to train on board.
Later, below decks, we were watching the TV.
They get the BBC news here, and have the internet and emails. Sometimes the ship has to switch it all off, and no one can communicate with the outside world.
Troops beginning to get fed up
A report came on. Politicians talking about perhaps giving Saddam Hussein more time to disarm before attacking him.
That doesn't go down well with many of the troops here. Some are getting fed up.
They've been at sea for sometime now. They want to know if they are going to have to fight. And if not, they want to go home.