Exploring the most discreet and clandestine vote in existence.

This must be the most secretive election in the world.

When 133 Catholic cardinals are shut into the Sistine Chapel on Wednesday to choose a successor to Pope Francis, each one will have sworn an oath on the gospels to keep the details under wraps for life.

The same goes for every person inside the Vatican during the conclave: from the two doctors on hand for any emergency, to the dining-room staff who feed the cardinals. All vow to observe “absolute and perpetual secrecy”.