Production vans supplied by ADF, which specialises in make-up trailers and offices, have set up camp in a car park at the Lakeside North Harbour site in Cosham where they will stay until Saturday (May 14).
The convoy – that also includes a catering van – is acting as a hub for filming on location at the naval base further south in Portsea.
Crew members at the Lakeside site told The News the project was titled My Mother’s Wedding – although codenames or working titles are commonly used in film and television while work is underway.
In response to a query by The News, a Royal Navy spokeswoman said: ‘For commercial reasons it would be inappropriate to comment.’
Earlier this year film crews and movie star Tom Hardy were spotted in the New Forest for a new adaptation of Charles Dickens’ Great Expectations.