HMS Queen Elizabeth: On the new UK aircraft carrier's bridge
4 July 2014 Last updated at 00:49 BST
The Royal Navy's new aircraft carrier is being officially named by the Queen on Friday.
HMS Queen Elizabeth is one of two new carriers being built at a cost of £6.2bn.
Ten thousand workers at six different shipyards have been involved in the carrier's construction and she is not due to be handed over to the navy until 2017.
The government may yet decide to mothball the second carrier for cost reasons.
Ahead of the naming ceremony, BBC defence correspondent Caroline Wyatt was given a tour of some of the new ship's key features.