▁the ▁under ground ▁factory ▁is ▁unknown ▁as ▁the ▁main ▁entrance ▁from ▁the ▁prom en ade ▁has ▁been ▁built ▁on ▁and ▁the ▁factory ▁that ▁it ▁served ▁was ▁demol ished ▁after ▁Short s ▁left ▁in ▁ 1 9 4 9 . ▁The ▁C AV ▁company ▁took ▁over ▁the ▁factory ▁until ▁the ▁late ▁ 1 9 8 0 s . ▁ ▁The ▁tower ▁was ▁transferred ▁by ▁English ▁Heritage ▁to ▁private ▁developers ▁in ▁the ▁late ▁ 1 9 9 0 s ▁and ▁has ▁now ▁been ▁converted ▁to ▁apart ments . ▁From ▁the ▁outside , ▁the ▁tower ▁has ▁been ▁restored ▁to ▁pr ist ine ▁condition ▁although ▁there ▁is ▁an ▁obvious ▁contemporary ▁structure ▁added ▁on ▁the ▁roof . ▁On ▁both ▁sides ▁the ▁lowest ▁pair ▁of ▁em bras ures ▁appear ▁to ▁be ▁below ▁ground ▁level ▁which ▁indicates ▁that ▁originally ▁the ▁d itch ▁was ▁much ▁deeper ▁and ▁more ▁form id able ▁than ▁it ▁now ▁appears . ▁On ▁the ▁east ▁site , ▁the ▁brow ▁of ▁the ▁hill ▁has ▁also ▁been ▁fl atten ed ▁to ▁allow ▁houses ▁to ▁be ▁built ▁and ▁therefore ▁the ▁strateg ic ▁domin ance ▁of ▁the ▁location ▁harder ▁to ▁visual ise . ▁The ▁tunnel ▁complex ▁is ▁se aled ▁off ▁but ▁maintained ▁by ▁English ▁Heritage . ▁As ▁late ▁as ▁ 2 0 0 0 , ▁the ▁developers ▁reported ly ▁found ▁war - time ▁aircraft ▁components ▁in ▁the ▁parts ▁of ▁the ▁t unn els ▁they ▁visited . ▁The ▁site ▁is ▁a ▁Sch eduled ▁An cient ▁Monument . ▁ ▁Further ▁reading ▁▁ ▁Def ender ▁of ▁the ▁Med way , ▁prison , ▁as yl