It’s the mid-19th century, and HMS Asp is on a routine mission charting the British coastline for the Royal Navy. But strange sounds and a ghostly apparition unsettle the crew, far away from the safety of shore. As fear spreads among the men whispers of a haunting take hold.
Is this the strain of isolation playing tricks on the mind? Do the crew have cabin fever - or could someone, or something, be moving below decks?
Danny Robins investigates, with Evelyn Hollow and Dr Ciaràn O'Keeffe.
Presented by Danny Robins
Experts: Evelyn Hollow and Dr Ciaran O’Keeffe
Story sections by Victoria Lloyd
Research by Nancy Bottomley and John West
Filming and editing by Robb Leech
Editing and sound design by Charlie Brandon-King
Theme music by Katherine Priddy
Theme co-produced by Jennifer Ann Keller
Incidental music by Evelyn Sykes
Commissioning executive: Paula McDonnell
Commissioning editor: Rhian Roberts
Produced by Simon Barnard and Victoria Lloyd
A Bafflegab and Uncanny Media production for BBC Radio 4