Book excerpt: For over eighty years the SBS have sailed into the face of danger. Responsible for quick strikes, reconnaissance, and counter-terrorism, they are the world's foremost marine special forces unit. The SBS risk their lives at sea and on land, undertaking the most dangerous missions. 1981, the Arctic Ocean. Plans are underway to locate the wreck of HMS Edinburgh and the four tons of gold bullion it was carrying when it sank during World War II, The wreck has lain half a mile beneath the waves for forty years. But Mike Stewart's dangerous recovery mission also has political implications in the era of the Cold War...