On December 5, 1945, five Grumman Avengers with a crew of 14 left the U.S. Naval Air Station in Fort Lauderdale for a routine training flight. Three hours later, Flight 19 had disappeared without a trace into the area that would become known as the Bermuda Triangle. A Martin Mariner flying boat, with a crew of 12 and enough fuel for 24 hours, was sent out to search for the missing planes--and never returned to base. No wreckage or bodies were ever found. What really happened to Flight 19?

On May 17, 1968, the nuclear submarine USS Scorpion was making her way through the Mediterranean returning to base at Norfolk, Virginia, when she received top-secret orders to report on a mysterious group of Soviet warships and submarines lurking around the Azores. On May 21, the Scorpion completed her mission and signaled her return. But she never arrived back to base. Though the wreckage of the 3,000-ton submarine was later found, it revealed few clues to its demise.

On August 2, 1947, the British airliner Stardust took off from Buenos Aires heading to Santiago in a flight that would take the six passengers and five crew members over the Andes--but four minutes from landing in Santiago, the Stardust signaled and ended the Morse Code message with the strange word "Stendec." It was repeated twice, then silence--the plane had vanished. Fifty years later, an expedition found the crash site. We investigate possible causes of the crash and why it took so long to locate the wreckage.

On November 6, 1935, Sir Charles Kingsford Smith took off from an airport near London in a Lockheed Altair monoplane, the Lady Southern Cross. The Australian, one of the world's best-known pilots, was determined to win back the England-to-Australia air speed record from an English rival who had broken his record in 1934. Due in Singapore on November 8, Kingsford Smith had vanished without a trace. But when an aircraft wheel was found 19 months later, new clues emerged to add to the mystery.

The legend of D.B. Cooper. Did he really get away with the money?

On July 4, 1928, a private aircraft took off from Croydon, England's biggest commercial airport, headed for Brussels.

In the 1920s, advances in aviation technology drove adventurers higher, faster, and further. And it wasn't just men that caught the flying bug. We follow the attempts by three women to be the first of their sex to cross the Atlantic--Princess Loewenstein Wertheim, Frances Grayson, and Elsie Mackay. All three set off from the United Kingdom with high hopes of reaching the continent. But none made it. All three vanished somewhere over the Atlantic. What happened to these brave lady fliers?

The story of one of Great Britain's greatest WWI flying aces, Albert Ball.

On April 20, 1925, British explorer Colonel Percy Fawcett, his son Jack, and friend Raleigh Rimmel set off from a Brazilian frontier town into the Amazon jungle in search of a lost ancient city. Fawcett wrote his wife from Dead Horse Camp on May 29. It was the last time anyone heard from him or his companions. Were they murdered by tribesmen? Did they fall victim to a virulent jungle virus? Or did they find the lost city and spend the rest of their days there in splendid isolation?

In 1928, Umberto Nobile, an Italian pioneer of aerial exploration of the Arctic, set off for the North Pole aboard the airship Italia, along with a crew of 16 men. The Italia reached the North Pole and circled it for two hours before heading back. But bad weather set in and the Italia went into a dive and smashed into the ground, leaving 10 men sprawled on the ice. Then, with six men still aboard, the damaged airship rose and drifted north back towards the Pole--never to be seen again.

On April 4, 1943, a flight of US B-24 Liberator bombers took off from a desert airbase in Libya. Their target was the harbor of Naples--750 miles away. One Liberator, the Lady Be Good, reached Naples as the sun was going down, and rather than risk hitting civilian buildings accidentally, she turned south and headed back to base. But the Lady Be Good and her 9-man crew never arrived. What happened to the men and plane that vanished without a trace over the scorching Sahara Desert?

On the morning of January 10, 1954, a British Comet, one of the first turbojet airliners, took off from Rome headed to London with six crew and 29 passengers. 20 minutes after take-off, the captain radioed another airliner flying thousands of feet below, but the message was abruptly cut off. The Comet and the 35 people onboard were never seen nor heard from again! This was not the only Comet to disappear under mysterious circumstances. We'll look for possible explanations for the vanishing planes.

Is it possible to make a warship disappear? Many people believe that the U.S. destroyer Eldridge, while docked in Philadelphia in 1943, was rendered invisible at the flick of a switch. Moments later, the ship supposedly appeared 30,000 miles away in Norfolk, Virginia, then vanished again and materialized within minutes back in Philadelphia. Was the whole story the product of one man's imagination, or was the U.S. Navy really experimenting with making ships disappear?

On April 19, 1956, Commander Lionel Crabb--better known as Buster--and three fellow frogmen slipped into the harbor at Portsmouth aiming to spy on a Soviet cruiser that had arrived carrying Nikita Khrushchev on a goodwill visit to England. Crabb sent the other three back and went ahead, but never returned. Was the WWII war hero now a liability neutralized by British secret service? Was he captured and brainwashed by the Russians? Did his diving equipment fail? What really happened to Commander Crabb?

At 2 p.m. on July 30, 1975, Jimmy Hoffa--former president of the Teamsters--arrived at the Red Fox, a suburban Detroit restaurant, to meet two former colleagues to discuss winning back his old position. Following an earlier prison sentence for jury rigging and fraud, 62-year-old Hoffa had been banned from holding union office for 10 years. Hoffa never returned from his meeting, and his family never saw him again. He had vanished without a trace. Join as we search for clues to the mystery.

In 1967, Donald Campbell attempted to break the world water speed record of 276 miles per hour--one he set three years earlier. With a goal of 300 m.p.h., on January 4, his jet-powered boat roared down Coniston Water in Britain's Lake District, hitting 297 m.p.h. On his second run, to the horror of onlookers, his boat lifted 50 feet, somersaulted, smashed back down, cart wheeled, and vanished in a torrent of spray. Though divers located pieces of wreckage the next day, no trace of Campbell was found.

On December 5, 1945, five Grumman Avengers with a crew of 14 left the U.S. Naval Air Station in Fort Lauderdale for a routine training flight. Three hours later, Flight 19 had disappeared without a trace into the area that would become known as the Bermuda Triangle. A Martin Mariner flying boat, with a crew of 12 and enough fuel for 24 hours, was sent out to search for the missing planes--and never returned to base. No wreckage or bodies were ever found. What really happened to Flight 19?

On May 17, 1968, the nuclear submarine USS Scorpion was making her way through the Mediterranean returning to base at Norfolk, Virginia, when she received top-secret orders to report on a mysterious group of Soviet warships and submarines lurking around the Azores. On May 21, the Scorpion completed her mission and signaled her return. But she never arrived back to base. Though the wreckage of the 3,000-ton submarine was later found, it revealed few clues to its demise.

On August 2, 1947, the British airliner Stardust took off from Buenos Aires heading to Santiago in a flight that would take the six passengers and five crew members over the Andes--but four minutes from landing in Santiago, the Stardust signaled and ended the Morse Code message with the strange word "Stendec." It was repeated twice, then silence--the plane had vanished. Fifty years later, an expedition found the crash site. We investigate possible causes of the crash and why it took so long to locate the wreckage.

On November 6, 1935, Sir Charles Kingsford Smith took off from an airport near London in a Lockheed Altair monoplane, the Lady Southern Cross. The Australian, one of the world's best-known pilots, was determined to win back the England-to-Australia air speed record from an English rival who had broken his record in 1934. Due in Singapore on November 8, Kingsford Smith had vanished without a trace. But when an aircraft wheel was found 19 months later, new clues emerged to add to the mystery.

The legend of D.B. Cooper. Did he really get away with the money?

On July 4, 1928, a private aircraft took off from Croydon, England's biggest commercial airport, headed for Brussels.

In the 1920s, advances in aviation technology drove adventurers higher, faster, and further. And it wasn't just men that caught the flying bug. We follow the attempts by three women to be the first of their sex to cross the Atlantic--Princess Loewenstein Wertheim, Frances Grayson, and Elsie Mackay. All three set off from the United Kingdom with high hopes of reaching the continent. But none made it. All three vanished somewhere over the Atlantic. What happened to these brave lady fliers?

The story of one of Great Britain's greatest WWI flying aces, Albert Ball.

On April 20, 1925, British explorer Colonel Percy Fawcett, his son Jack, and friend Raleigh Rimmel set off from a Brazilian frontier town into the Amazon jungle in search of a lost ancient city. Fawcett wrote his wife from Dead Horse Camp on May 29. It was the last time anyone heard from him or his companions. Were they murdered by tribesmen? Did they fall victim to a virulent jungle virus? Or did they find the lost city and spend the rest of their days there in splendid isolation?

In 1928, Umberto Nobile, an Italian pioneer of aerial exploration of the Arctic, set off for the North Pole aboard the airship Italia, along with a crew of 16 men. The Italia reached the North Pole and circled it for two hours before heading back. But bad weather set in and the Italia went into a dive and smashed into the ground, leaving 10 men sprawled on the ice. Then, with six men still aboard, the damaged airship rose and drifted north back towards the Pole--never to be seen again.

On April 4, 1943, a flight of US B-24 Liberator bombers took off from a desert airbase in Libya. Their target was the harbor of Naples--750 miles away. One Liberator, the Lady Be Good, reached Naples as the sun was going down, and rather than risk hitting civilian buildings accidentally, she turned south and headed back to base. But the Lady Be Good and her 9-man crew never arrived. What happened to the men and plane that vanished without a trace over the scorching Sahara Desert?

On the morning of January 10, 1954, a British Comet, one of the first turbojet airliners, took off from Rome headed to London with six crew and 29 passengers. 20 minutes after take-off, the captain radioed another airliner flying thousands of feet below, but the message was abruptly cut off. The Comet and the 35 people onboard were never seen nor heard from again! This was not the only Comet to disappear under mysterious circumstances. We'll look for possible explanations for the vanishing planes.

Is it possible to make a warship disappear? Many people believe that the U.S. destroyer Eldridge, while docked in Philadelphia in 1943, was rendered invisible at the flick of a switch. Moments later, the ship supposedly appeared 30,000 miles away in Norfolk, Virginia, then vanished again and materialized within minutes back in Philadelphia. Was the whole story the product of one man's imagination, or was the U.S. Navy really experimenting with making ships disappear?

On April 19, 1956, Commander Lionel Crabb--better known as Buster--and three fellow frogmen slipped into the harbor at Portsmouth aiming to spy on a Soviet cruiser that had arrived carrying Nikita Khrushchev on a goodwill visit to England. Crabb sent the other three back and went ahead, but never returned. Was the WWII war hero now a liability neutralized by British secret service? Was he captured and brainwashed by the Russians? Did his diving equipment fail? What really happened to Commander Crabb?

At 2 p.m. on July 30, 1975, Jimmy Hoffa--former president of the Teamsters--arrived at the Red Fox, a suburban Detroit restaurant, to meet two former colleagues to discuss winning back his old position. Following an earlier prison sentence for jury rigging and fraud, 62-year-old Hoffa had been banned from holding union office for 10 years. Hoffa never returned from his meeting, and his family never saw him again. He had vanished without a trace. Join as we search for clues to the mystery.

In 1967, Donald Campbell attempted to break the world water speed record of 276 miles per hour--one he set three years earlier. With a goal of 300 m.p.h., on January 4, his jet-powered boat roared down Coniston Water in Britain's Lake District, hitting 297 m.p.h. On his second run, to the horror of onlookers, his boat lifted 50 feet, somersaulted, smashed back down, cart wheeled, and vanished in a torrent of spray. Though divers located pieces of wreckage the next day, no trace of Campbell was found.

On December 5, 1945, five Grumman Avengers with a crew of 14 left the U.S. Naval Air Station in Fort Lauderdale for a routine training flight. Three hours later, Flight 19 had disappeared without a trace into the area that would become known as the Bermuda Triangle. A Martin Mariner flying boat, with a crew of 12 and enough fuel for 24 hours, was sent out to search for the missing planes--and never returned to base. No wreckage or bodies were ever found. What really happened to Flight 19?

On May 17, 1968, the nuclear submarine USS Scorpion was making her way through the Mediterranean returning to base at Norfolk, Virginia, when she received top-secret orders to report on a mysterious group of Soviet warships and submarines lurking around the Azores. On May 21, the Scorpion completed her mission and signaled her return. But she never arrived back to base. Though the wreckage of the 3,000-ton submarine was later found, it revealed few clues to its demise.

On August 2, 1947, the British airliner Stardust took off from Buenos Aires heading to Santiago in a flight that would take the six passengers and five crew members over the Andes--but four minutes from landing in Santiago, the Stardust signaled and ended the Morse Code message with the strange word "Stendec." It was repeated twice, then silence--the plane had vanished. Fifty years later, an expedition found the crash site. We investigate possible causes of the crash and why it took so long to locate the wreckage.

On November 6, 1935, Sir Charles Kingsford Smith took off from an airport near London in a Lockheed Altair monoplane, the Lady Southern Cross. The Australian, one of the world's best-known pilots, was determined to win back the England-to-Australia air speed record from an English rival who had broken his record in 1934. Due in Singapore on November 8, Kingsford Smith had vanished without a trace. But when an aircraft wheel was found 19 months later, new clues emerged to add to the mystery.

The legend of D.B. Cooper. Did he really get away with the money?

On July 4, 1928, a private aircraft took off from Croydon, England's biggest commercial airport, headed for Brussels.

In the 1920s, advances in aviation technology drove adventurers higher, faster, and further. And it wasn't just men that caught the flying bug. We follow the attempts by three women to be the first of their sex to cross the Atlantic--Princess Loewenstein Wertheim, Frances Grayson, and Elsie Mackay. All three set off from the United Kingdom with high hopes of reaching the continent. But none made it. All three vanished somewhere over the Atlantic. What happened to these brave lady fliers?

The story of one of Great Britain's greatest WWI flying aces, Albert Ball.

On April 20, 1925, British explorer Colonel Percy Fawcett, his son Jack, and friend Raleigh Rimmel set off from a Brazilian frontier town into the Amazon jungle in search of a lost ancient city. Fawcett wrote his wife from Dead Horse Camp on May 29. It was the last time anyone heard from him or his companions. Were they murdered by tribesmen? Did they fall victim to a virulent jungle virus? Or did they find the lost city and spend the rest of their days there in splendid isolation?

In 1928, Umberto Nobile, an Italian pioneer of aerial exploration of the Arctic, set off for the North Pole aboard the airship Italia, along with a crew of 16 men. The Italia reached the North Pole and circled it for two hours before heading back. But bad weather set in and the Italia went into a dive and smashed into the ground, leaving 10 men sprawled on the ice. Then, with six men still aboard, the damaged airship rose and drifted north back towards the Pole--never to be seen again.

On April 4, 1943, a flight of US B-24 Liberator bombers took off from a desert airbase in Libya. Their target was the harbor of Naples--750 miles away. One Liberator, the Lady Be Good, reached Naples as the sun was going down, and rather than risk hitting civilian buildings accidentally, she turned south and headed back to base. But the Lady Be Good and her 9-man crew never arrived. What happened to the men and plane that vanished without a trace over the scorching Sahara Desert?

On the morning of January 10, 1954, a British Comet, one of the first turbojet airliners, took off from Rome headed to London with six crew and 29 passengers. 20 minutes after take-off, the captain radioed another airliner flying thousands of feet below, but the message was abruptly cut off. The Comet and the 35 people onboard were never seen nor heard from again! This was not the only Comet to disappear under mysterious circumstances. We'll look for possible explanations for the vanishing planes.

Is it possible to make a warship disappear? Many people believe that the U.S. destroyer Eldridge, while docked in Philadelphia in 1943, was rendered invisible at the flick of a switch. Moments later, the ship supposedly appeared 30,000 miles away in Norfolk, Virginia, then vanished again and materialized within minutes back in Philadelphia. Was the whole story the product of one man's imagination, or was the U.S. Navy really experimenting with making ships disappear?

On April 19, 1956, Commander Lionel Crabb--better known as Buster--and three fellow frogmen slipped into the harbor at Portsmouth aiming to spy on a Soviet cruiser that had arrived carrying Nikita Khrushchev on a goodwill visit to England. Crabb sent the other three back and went ahead, but never returned. Was the WWII war hero now a liability neutralized by British secret service? Was he captured and brainwashed by the Russians? Did his diving equipment fail? What really happened to Commander Crabb?

At 2 p.m. on July 30, 1975, Jimmy Hoffa--former president of the Teamsters--arrived at the Red Fox, a suburban Detroit restaurant, to meet two former colleagues to discuss winning back his old position. Following an earlier prison sentence for jury rigging and fraud, 62-year-old Hoffa had been banned from holding union office for 10 years. Hoffa never returned from his meeting, and his family never saw him again. He had vanished without a trace. Join as we search for clues to the mystery.

In 1967, Donald Campbell attempted to break the world water speed record of 276 miles per hour--one he set three years earlier. With a goal of 300 m.p.h., on January 4, his jet-powered boat roared down Coniston Water in Britain's Lake District, hitting 297 m.p.h. On his second run, to the horror of onlookers, his boat lifted 50 feet, somersaulted, smashed back down, cart wheeled, and vanished in a torrent of spray. Though divers located pieces of wreckage the next day, no trace of Campbell was found.