It was supposedly 'the year of the Navy', at least according to Defence Secretary Michael Fallon.
The Navy fleet welcomed the new £3 billion aircraft carrier, HMS Queen Elizabeth, into the port in August. It was then commissioned by the Queen on 7th December 2017.
But there's still a £25 billion pound hole in the defence budget - the RAF and Army have already been reduced - and more Navy cuts could be on the way.
The number of full-time navy personnel has gone down from 35,000 to 29,000. The fleet had 31 frigates and destroyers in the year 2000. It now has 19.
Our reporter Richard Jones has been assessing the state of the navy at the end of an eventful year.