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Hundreds of shoppers have thundered above the tunnels underneath Westwood Cross’ Primark store without a second thought.
The store opened in 2011 – and no one had a clue of what lay beneath.
Just four years later the underworld was discovered when Primark was forced to undertake emergency repairs.
The tunnels are believed to be more than 100 years old and were thought to have been used in both world wars.
In the Second World War, Thanet was subject to a number of German air raids and residents would seek shelter from the bombs underground.
A Freedom of Information request submitted to the MoD, however, could not shed light on the exact purpose of the tunnels.