Tomorrow, Fort Blockhouse and the SETT Tower are opening the doors to their hidden heritage, while on Sunday there will be a special British Signed Language tour of HMS Alliance.

All of the events will be part of the Gosport Heritage Open Days event.

The Fort Blockhouse Submariner’s tour will include a visit to the Submariner’s Memorial chapel and the Officers Mess to see the Wyllie paintings.

New for this year is a visit to the SETT tower, where submariners are trained to escape when disaster strikes on board.

Bill Sainsbury, event manager at the Royal Navy Submarine Museum, says: ‘We are really delighted to have the support of Fort Blockhouse for the behind-the-scenes tours and to be able to hold a special BSL tour of our own historic HMS Alliance.’

The museum is open every day from 10am – 5.30pm.

Heritage Open Days tickets are free but must be booked in advance. Either go online at eventbrite.com, call the Royal Navy Submarine Museum on (023) 9254 5036 or go to submarine-museum.co.uk.