Watch The Sea Hunters online: Episode 1 Hunley: The First Kill

Two historic shipwrecks, separated by five decades and hundreds of kilometres apart, tell the tale of man's newfound ability to strike at his enemies from beneath the sea. Join The Sea Hunters as they search for the remains of two vessels that introduced submarine warfare to the world; Germany's U-21 which drew first blood in the early days of the First World War; and the innovative underwater fighting ship lost by the Confederate Navy during the American Civil War - the H.L. Hunley. Searching for shipwrecks can be a time consuming venture. The search can last for a day or for a lifetime. Wrecks can be found hiding in the middle of an ocean, in a harbour, or even under the pavement of a parking lot. The uncovering of a long-lost wreck represents the end of a hunt and the beginning of a story. Two shipwrecks that especially intrigue me provide an insight into the development of modern navies. The actions of these two vessels changed the very face of naval warfare forever. They were the first two submarines in history to sink an enemy warship. Today, the evolution of man's ability to strike from beneath the waves is moving toward its full potential. The two vessels that started us on this evolutionary path were the first underwater warriors. The first of their kind to seek enemy ships in battle. They were Germany's U-21, a gray wolf which drew first blood during the opening days of the First World War; and the extraordinary underwater fighting ship wielded and lost by the Confederacy during the American Civil War, the legendary HL Hunley. These two vessels mark important turning points in the evolution of the modern submarine. And both have gone down in history as the vessels that got the first kill. The team will voyage to the waters of the North Sea, in search of one of the most celebrated and feared U-boats of the first world war, U-21, and to a state of the art conservation facility in South Carolina to view the famous Hunley, creating a modern day link with these two warriors from the past.

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