Visit the remains of the Ta' Kaccatura Roman villa in Birzebbuga and the underwater cistern. In the second half of the program we have a look at the underground vaults of archbishop Cagliari's palace.

We explore the counter-mines, crypt and oil stores found do under the ground of Fort Manoel on Manoel Island. We also have a look at the vaults and counter - mines found in the ditch of the San Salvatore bastion in San Maison.

The basements and subterranean passages beneath the grand master's palace in Valletta are explored as well as the underground vaults of Pinto's Auberge de Castille.

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Uncover the secrets of dried Franciscan friars buried underground and explore the huge Vendomme reservoir intended to supply fort St Elmo with water in case of a long siege.

Take a walk through the "Mina s-Sewda" which has earned a place in Maltese folklore. We also explore the underground fuel stores found in Has-Saptan which were designed to survive a nuclear attack.

A secret military base, shelter and possibly even a secret prison are discovered by chance when making preparations for constructing a parking area in Santa Venera.

We explore the underground labyrinth of St Agatha's catacombs in Rabat where the dead were laid to rest and the dreaded "oubliette" in Fort St Angel were the condemned craved death to relieve them of their misery.

Explore the depths of the strongly fortified Mosta Fort. Then have a look at the first ever WWII shelter excavated in Malta in Senglea.

This episode has no summary.