ZDF Enterprises

Off the north coast of Ireland, deep-sea divers discover the wreck of a massive battleship. She is the British superdreadnought, HMS Audacious, which sank in the early days of the First World War. The pride of the Royal Navy, Audacious was considered unsinkable. Today she lies 23 kilometres out to sea, in 64 metres of water, in perhaps the best visibility for a warship of her size anywhere in the world. The expedition’s divers find evidence of a mysterious catastrophic explosion, strewing wreckage across the seabed. They reveal how one of the world’s most advanced ships was brought down by a single unexpected blow, a chance event that began a new chapter in naval warfare and changed the course of history.