Are we talking about The Royal Navy Submarine Museum From junction 11of the M27 follow the A32 through Gosport Pass the Gosport Ferry and turn left at the Public House. Follow Haslar Road over Haslar Bridge. The Museum car park is 2nd left. Information from http://www.submarine-museum.demon.co.uk/info.html and http://www.submarine-museum.demon.co.uk/index.html