Brave deadly radiation and nuclear warheads as you dive into the abyss with the crew to raise sunken submarines. Discover the untold story behind the doomed Russian sub Kursk and witness remarkable feats of engineering as the team struggles to raise the Civil War sub the H.L. Hunley. Watch as the team rescues survivors trapped inside a submarine 243 feet down on the seabed. Finally learn about one of history's most famous subs-the HMS Holland One.