 Inside the Rock of Gibraltar itself , miles of tunnels were excavated from the limestone . Masses of rock were blasted out to build an " underground city " . In huge man @-@ made caverns , barracks , offices , and a fully equipped hospital were constructed , complete with an operating theatre and X @-@ ray equipment . 
 Inside the Rock of Gibraltar itself , miles of tunnels <a href='uninflect' title='1'><mark>were</mark></a> excavated from the limestone . Masses of rock <a href='uninflect' title='2'><mark>were</mark></a> blasted out to build an " underground city " . In huge man @-@ made caverns , barracks , offices , and a fully equipped hospital <a href='uninflect' title='3'><mark>were</mark></a> constructed , complete with an operating theatre and X @-@ ray equipment . 
Inside da Rock of Gibraltar itself , miles of tunnels was excavated from tdalimestone . Masses of rock was blasted out to build an " underground city " . In bigass man @-@ made caverns , barracks , offices , and a fully equipped hospital was constructed , complete witt an operating theatre and X @-@ ray equipment .