Visited July 2007 with Zero
Credit to Markr for researching and re-discovering this bunker.
Supposedly a D-Day back-up bunker for Fort Southwick. Apart from this rumour no other information is known on this bunker. Built in a similar style to that of the London underground, the bunker consists of a main passageway with rooms on either side.
There were originally two entrances to the bunker, one is now lost under a building from where the area was re-developed, the other is hidden.