In August 2005, John Chatterton and Richie Kohler, hosts of Deep Sea Detectives, led an expedition to the wreck of RMS Titanic. Diving 2 miles down in Russian submersibles, they searched outside the known debris field for new evidence. On their final dive they made an extraordinary find: two large intact sections of the bottom hull of the Titanic in pristine condition with the red bottom paint still on them. For four months, a team of historians, marine architects, and engineers has been conducting a forensic analysis of this find. All agree that it's the most significant new discovery since the wreck was located in 1985. Analysis is ongoing, but preliminary indications are that these bottom sections will change our understanding of how the ship broke apart, and rewrite the story of the final moments of the Titanic.

Did Titanic have a fatal design flaw? In August of 2005 John Chatterton and Richie Kohler (of "Deep Sea Detectives") led an expedition to Titanic, where they discovered two huge intact sections of the ship's bottom, the red paint still on. Naval architect Roger Long, along with a panel of experts concluded that Titanic broke apart earlier in its sinking than has been believed, due to a previously unknown design flaw. Chatterton and Kohler return to the wreck in 2006 searching for evidence to support this theory, but when their research vessel is recalled by the Russian government they head to Greece to dive Titanic's lost sister ship Britannic. Was Britannic quietly modified to correct the problem?

A team of scientists, engineers, and imaging experts have joined forces to answer one of the most haunting questions surrounding the legendary disaster: Just how did the "unsinkable" ship break apart and plunge into the icy waters of the North Atlantic on April 15, 1912? Previously, we followed the world's top underwater experts in the most thorough and exhaustive study of the wreck ever made. The undertaking yielded unprecedented new discoveries and the first comprehensive map of Titanic's watery grave. This 2-hour special documents this mission, captures the high-tech mapmaking process, unveils astonishing pieces of never-before-seen wreckage, and presents the expedition's unexpected findings.

Considered the "Everest of wreck diving," the Britannic was discovered in 1976 on an Underwater Exploration by Jacques Cousteau. The Britannic is the larger sister to the ill-fated Titanic. On November 21, 1916, Britannic was steaming through the Kea Channel in the Aegean when an explosion ripped through the ship causing the world's largest ocean liner to sink. Whether it was a German mine or submarine torpedo that sank her, a bigger mystery remains: Why did this giant ship sink so fast? It took her only 55 minutes to disappear beneath the ocean waves, three times faster than Titanic. Join wreck divers John Chatterton and Richie Kohler as they lead an expedition to unravel this mystery of the Britannic's final hour.

100 years after its sinking the world's most famous shipwreck is being rediscovered in 3D. A new expedition brings us closer to Titanic than ever before. For the first time, 3D cameras deliver real time images from the ocean floor... 2.5 miles down. Advanced sonar technology and 3D footage reveal startling details, and give new meaning to firsthand accounts from passengers and crew. The most extensive visual survey of the site is helping to answer 100-year-old questions of how the once-proud ship became a mass of twisted steel on the bottom of the Atlantic. 3D cameras crisscross 15 square miles of the wreck site discovering never-before-seen sections of Titanic. The astonishing new dimensions help experts piece together stories from those who survived... and those who did not. This immersive 3D voyage allows us to experience Titanic as its passengers did 100 years ago.

In August 2005, John Chatterton and Richie Kohler, hosts of Deep Sea Detectives, led an expedition to the wreck of RMS Titanic. Diving 2 miles down in Russian submersibles, they searched outside the known debris field for new evidence. On their final dive they made an extraordinary find: two large intact sections of the bottom hull of the Titanic in pristine condition with the red bottom paint still on them. For four months, a team of historians, marine architects, and engineers has been conducting a forensic analysis of this find. All agree that it's the most significant new discovery since the wreck was located in 1985. Analysis is ongoing, but preliminary indications are that these bottom sections will change our understanding of how the ship broke apart, and rewrite the story of the final moments of the Titanic.

Did Titanic have a fatal design flaw? In August of 2005 John Chatterton and Richie Kohler (of "Deep Sea Detectives") led an expedition to Titanic, where they discovered two huge intact sections of the ship's bottom, the red paint still on. Naval architect Roger Long, along with a panel of experts concluded that Titanic broke apart earlier in its sinking than has been believed, due to a previously unknown design flaw. Chatterton and Kohler return to the wreck in 2006 searching for evidence to support this theory, but when their research vessel is recalled by the Russian government they head to Greece to dive Titanic's lost sister ship Britannic. Was Britannic quietly modified to correct the problem?

A team of scientists, engineers, and imaging experts have joined forces to answer one of the most haunting questions surrounding the legendary disaster: Just how did the "unsinkable" ship break apart and plunge into the icy waters of the North Atlantic on April 15, 1912? Previously, we followed the world's top underwater experts in the most thorough and exhaustive study of the wreck ever made. The undertaking yielded unprecedented new discoveries and the first comprehensive map of Titanic's watery grave. This 2-hour special documents this mission, captures the high-tech mapmaking process, unveils astonishing pieces of never-before-seen wreckage, and presents the expedition's unexpected findings.

Considered the "Everest of wreck diving," the Britannic was discovered in 1976 on an Underwater Exploration by Jacques Cousteau. The Britannic is the larger sister to the ill-fated Titanic. On November 21, 1916, Britannic was steaming through the Kea Channel in the Aegean when an explosion ripped through the ship causing the world's largest ocean liner to sink. Whether it was a German mine or submarine torpedo that sank her, a bigger mystery remains: Why did this giant ship sink so fast? It took her only 55 minutes to disappear beneath the ocean waves, three times faster than Titanic. Join wreck divers John Chatterton and Richie Kohler as they lead an expedition to unravel this mystery of the Britannic's final hour.

100 years after its sinking the world's most famous shipwreck is being rediscovered in 3D. A new expedition brings us closer to Titanic than ever before. For the first time, 3D cameras deliver real time images from the ocean floor... 2.5 miles down. Advanced sonar technology and 3D footage reveal startling details, and give new meaning to firsthand accounts from passengers and crew. The most extensive visual survey of the site is helping to answer 100-year-old questions of how the once-proud ship became a mass of twisted steel on the bottom of the Atlantic. 3D cameras crisscross 15 square miles of the wreck site discovering never-before-seen sections of Titanic. The astonishing new dimensions help experts piece together stories from those who survived... and those who did not. This immersive 3D voyage allows us to experience Titanic as its passengers did 100 years ago.

In 1918, a mountain of death piled up across the world, as the Spanish Flu rampaged through country after country. The world almost came to a halt--in the last week of October, 21,000 died in the U.S. The flu could mutate in a breath.

Take a front row seat to a period of U.S. history from 1930-1940 when America's heartland was ravaged by a weather phenomenon that became known as a "black blizzard.

America's infrastructure is collapsing. Tens of thousands of bridges are structurally deficient or functionally obsolete. A third of the nation's highways are in poor or mediocre shape. Massively leaking water and sewage systems are creating health hazards and contaminating rivers and streams. Weakened and under-maintained levees and dams tower over communities and schools. And the power grid is increasingly maxed out, disrupting millions of lives and putting entire cities in the dark. The Crumbling of America explores these problems using expert interviews, on location shooting, and computer generated animation to illustrate the kinds of infrastructure disasters that could be just around the bend.

Inflicting over $80 billion in damage, and causing the deaths of over 1,800 people, Hurricane Katrina was among the greatest engineering disasters in US history. But was Katrina the "big one" New Orleans had been waiting for? Many believe the "perfect storm" is yet to come. If and when the big one does hit, will New Orleans be ready? The answers are in the underground. From the Army Corps' latest levees to last-ditch efforts to save New Orleans' vanishing wetlands, we're going deep into New Orleans' underground to see where New Orleans stands, and if it stands a chance.

Considered the "Everest of wreck diving," the Britannic was discovered in 1976 on an Underwater Exploration by Jacques Cousteau. The Britannic is the larger sister to the ill-fated Titanic. On November 21, 1916, Britannic was steaming through the Kea Channel in the Aegean when an explosion ripped through the ship causing the world's largest ocean liner to sink. Whether it was a German mine or submarine torpedo that sank her, a bigger mystery remains: Why did this giant ship sink so fast? It took her only 55 minutes to disappear beneath the ocean waves, three times faster than Titanic. Join wreck divers John Chatterton and Richie Kohler as they lead an expedition to unravel this mystery of the Britannic's final hour.

100 years after its sinking the world's most famous shipwreck is being rediscovered in 3D. A new expedition brings us closer to Titanic than ever before. For the first time, 3D cameras deliver real time images from the ocean floor... 2.5 miles down. Advanced sonar technology and 3D footage reveal startling details, and give new meaning to firsthand accounts from passengers and crew. The most extensive visual survey of the site is helping to answer 100-year-old questions of how the once-proud ship became a mass of twisted steel on the bottom of the Atlantic. 3D cameras crisscross 15 square miles of the wreck site discovering never-before-seen sections of Titanic. The astonishing new dimensions help experts piece together stories from those who survived... and those who did not. This immersive 3D voyage allows us to experience Titanic as its passengers did 100 years ago.