'As Above, So Below' trailer unveiled

The dark secret of the notorious Paris catacombs is unravelled in the trailer of horror film 'As Above, So Below'.

Ben Feldman and Perdita Weeks portray explorers leading an expedition to a secret locked chamber below the streets of Paris, reported Entertainment Weekly.

The duo manage to find their way into the world's oldest mass grave, but are at the mercy of supernatural creatures.

'As Above, So Below' has been produced by Legendary Pictures, with John Erick Dowdle aboard as a filmmaker.

Dowdle has previously directed the horror hits 'Quarantine' and 'Devil'.