2005年夏天，在意大利海岸外120米深处发现了一艘神秘的潜艇。对于水下海洋考古学家洛伦佐·德尔·韦内齐亚诺（Lorenzo del Veneziano）来说，这是令人惊叹的一幕。这艘潜艇完好无损！它几乎垂直地矗立在海底，船体嵌在沉积物中。这艘船有着怎样的故事，它为何会在这里呢？通过揭开它的起源之谜……

A British convoy is trying to elude a group of German U-Boats.

Posing as an ex-German medical officer, a U. S. Navy Intelligence Officer sets out to rescue a kidnapped scientist, and sink a Nazi submarine, hiding off the coast of South America.

Leonardo da Vinci is not just the most famous and most admired of all painters - he is an icon, a superstar. Yet, the man himself remains elusive. Accounts during his lifetime describe a man too handsome, too strong, too perfect to be accurate. But in 2009, the chance discovery in the South of Italy of an ancient portrait with strangely familiar features takes the art world by storm. Could this be an unknown self-portrait by Leonardo da Vinci? Controversy erupts among the experts. The implications of such a discovery have far-reaching consequences for our understanding of the work of this great Renaissance master.

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Follows U.S., Canadian, and European scientists from the barrens of Labrador - where archaeologists uncover an ancient stone burial mound - to sites in the U.S., France, England, and Denmark, and to the vast fjords of northernmost Norway where monumental standing stones testify to links among seafaring cultures across immense distances.

Using a futuristic submarine, pirates kidnap a young couple, torpedo a passenger ship, travel under the sea to salvage bullion, then make their escape by taking to the air.

Join "Nova" science detectives as they journey to Southeast Asia to reveal details of one of Earth's most destructive volcanic events. Known as the Toba eruption, this cataclysmic explosion that occurred 75,000 years ago is considered one of the most devastating natural occurrences in history. Watch scientists reconstruct this monstrous catastrophe as they ponder the fragile nature of Earth's crust and the power of the magma within its core.

A movie serial in 13 chapters: Some swampland becomes valuable, and various factions squabble over ownership of it.

A group of teenagers are trying to solve a mystery of a puzzle created and left to them by the dead boy.