| Address | Fareham PO17 6AR, UK |
| County | Hampshire |
| Location type | Headquarters Site |
| Access | Private |
| Site Ownership and Access Information | Fort Southwick is privately owned and there is currently no access to the public. |
| Contact details |
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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.
