THE opening of a futuristic building at Gosport's Royal Navy Submarine Museum comes a step closer tomorrow when a "topping out" ceremony takes place.

Shaped like a submarine, the John Fieldhouse Building will be completed this summer as part of a £3.1m expansion.

Lady Midge Fieldhouse will perform the ceremony at the building, which honours her late husband, Admiral of the Fleet Lord John Fieldhouse from Gosport - the most senior submariner in history.

The building will house the historic X-craft mini-submarine HMSX24, galleries, exhibitions and a lecture area.