|Address||Fareham PO17 6AR, UK|
|Location type||Headquarters Site|
|Site Ownership and Access Information||Fort Southwick is privately owned and there is currently no access to the public.|
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During the Second World War, a network of tunnels was speciallly created underneath this Victorian fort. At the time of D-Day it housed the Combined Operations Underground Headquarters. From here, the progress of the Allied invasion fleet was co-ordinated and monitored. The headquarters staff included personnel from all three services, and members of the Women’s Royal Naval Service (WRNS) formed a major part of the staff.