The subterranean environs of London Below are brought to life in a new clip from the Radio 4/4 Extra adaptation of Neil Gaiman’s Neverwhere. Benedict Cumberbatch – as the enigmatic angel, Islington – half sings, half whispers some haunting verses as he stalks the echoing confines of his underground domain.

For an extra-eerie effect, open this page in two (or more) windows and start the clip playing for a second time, say 15/20 seconds after the first one has started (the more windows you open, the weirder it gets…)

The Radio Times website, ladies and gentlemen….