The History Channel

Whatever is in store--a massive cosmic collision, a global environmental disaster, an Armageddon-like religious showdown, or a more subtle transformation--many believe that December 21, 2012 will mark a major shift in the history of our planet. There is no cogent distinction between the sobering facts and hysterical fiction--what, if any, modern scientific proof exists? Is there any other compelling evidence throughout history that 2012 will be a year of unprecedented, deadly upheaval? This special looks for the parallels between the nightmarish daily headlines and the 2012 prophecies from Nostradamus and others. From the mystical realms of the Guatemalan jungles to the Hopi elders and Mayan shaman to respected thinkers of the modern age--Nostradamus' doomsday warning will be cast in a frighteningly modern context.

What if I told you the apocalyptic prophecies of 2012 were coming true? Across the globe, predictions from Mayan texts to the King James Bible appear to be coming true with eerie accuracy. What can we look forward to on December 21, 2012, the date Mayan astronomers list as the end of time? Will we fall prey to a massive natural disaster, an unnatural disaster brought about by harm to our environment, or will we do what the Mayans did and destroy ourselves? Decoded investigates the science and the psychology behind the doomsday prophecies of 2012.

Asteroids, comets, gamma ray bursts and the sun all combine to make the Earth a dangerous place to live. NASA's top brass and other scientists are arming themselves with the latest technology to pre-empt an apocalyptic attack. Watch and investigate bizarre, and terrifying apocalyptic scenarios and the ways that scientists are racing against the clock to develop technology to defend our planet.

In space travel there is a saying that the first 50 miles and the last 50 miles are the most dangerous. Explore the controlled explosion of launch, the fiery crucible of reentry and everything in between. See how a single spark inside a spacecraft or a micrometeoroid less than an inch wide hitting a space station can turn a routine mission into a lethal nightmare. As the missions become longer, venturing to Mars and beyond, the potential disasters will only become bigger. What would happen if a spacecraft ventured too close to a black hole or was hit by a gamma ray burst?

At this very moment, celestial forces prowl the Universe and threaten man's very existence. They're asteroids and comets--and they've left their imprint on planet Earth, literally. Initially, they helped build planets through violent collisions. During this fiery bombardment period, they may have even seeded Earth with water and the building blocks for life. Since the turbulent formation of the solar system, these space rocks have continued to impact earth. Some have been so violent that they've led to mass extinctions events, including one that wiped out the dinosaur. What's more, radical new theories suggest that asteroid and comet dust harbor deadly viruses that may have triggered some of our worst pandemics. The possibility of future cosmic collisions remains a legitimate threat. Yet, despite their dangers, asteroids and comets may hold vital natural resources, which could actually preserve mankind.

For most, it's the deadly centerpiece of the film Star Wars. But in truth, real death stars are in the final stage of life before they explode into supernovae and, occasionally, the biggest blast in the universe--the gamma ray burst (GRB). One death star, named WR104, lurks 8,000 light-years from Earth and some believe its GRB arrow is aimed directly at us. A death star galaxy named 3C321 is a terrifying vision of what could one day befall the Milky Way galaxy: a companion galaxy's black hole is hammering it with a constant blast of high-energy particles, wreaking havoc with its celestial bodies. Nearby, Death Stars Eta Carinae and Betelgeuse burn through their fuel supplies as they hurtle toward extinction--and possibly a violent ending that's too close for comfort.

Don't try this at home! In this episode, our experts cook up ten ways you could destroy the earth, including: swallowing it with a microscopic black hole; blowing it up with anti-matter; hurling it into the Sun, and switching off gravity. This is a fun way to explore the dangerous physics of the Universe and the properties of the planet we call home.

Without the moon, Earth would be a very different and desolate place today--four hours of sunlight with pitch-black nights, steady 100-mph winds spawning giant hurricanes that last for months, and virtually no complex life forms, much less humans. Safe to say, we probably owe our very existence to the moon. But what if it suddenly disappeared? Solar gravity redirects ocean water that floods coastal spots around the globe. Sea currents shift, resulting in freakish weather patterns. Eventually, earth's axis begins fluctuating wildly and climate change grows more extreme. The poles are tropical jungles and parts of the equator become frigid wastelands. Human evolution starts churning in unpredictable ways or ends completely. Without the moon, the Earth is a very different place.

Superhuman strength... Supernatural powers... And the awesome ability to fly. Throughout history, mankind has told incredible tales of gods with extraordinary powers. But are these accounts merely tall tales, or could they be based on factual events? If mythical gods really did exist, were they, as ancient astronaut theorists believe, extraterrestrial beings? And could this help to explain the enduring popularity of gods, titans and other so-called "super-heroes"?

If ancient aliens visited Earth, can evidence of their existence be found in the mysterious structures that still stand throughout the world? Inexplicably, megalithic structures found on different continents are strikingly similar, and the cutting and moving of the massive stones used to build these magnificent feats would be a struggle for modern day machinery, let alone ancient man. Ancient astronaut theorists suggest that the standing stones in Carnac, France were used as an ancient GPS system for ancient flying machines. The recently discovered Gobekli Tepe in Turkey, which has been dated back 12,000 years, has finely chiseled pillars that experts describe as a Noah's Ark in stone. Is it possible that extraterrestrials assisted primitive man in constructing these unexplained structures? If so, what was the purpose of these grand projects?

The Hopi people have warned us that the world is headed for extinction. Based in the Arizona Desert, the Native American tribe of the Hopi has been prophesying about the fate of society for centuries. They have accurately predicted the coming of the settlers to their land, the birth of telecommunication, and the worldwide spread of the internet. The Hopi believe that our actions have caused the earth to become out of balance which will lead to a cataclysmic great purification of the planet that few will survive. To herald these end times, the Hopi believe that a blue star will arise in the heavens, followed by a great shaking of the earth. These prophecies have been passed down from generation to generation and warn of massive earthquakes, tsunamis and super-volcanos that threaten the lives of millions. The Foster family of Illinois is prepping in their own way to be ready for the end.

The Book of Revelation: the New Testament s blueprint of doom foretells the coming of the Four Horsemen of the apocalypse, heralding the end of days. These horsemen will usher in four divine judgments that promise to devastate humanity. While skeptics dismiss it as a mere allegory, every Sunday around the Christian world, church pews reverberate with its dark prophecies. With the potential for global pandemic hiding in every unchecked sneeze, worldwide hunger at an all-time high and the specter of World War III hanging over the Middle East, Revelation s followers believe its dark imagery is coming to light in modern times. Believer and prepper Ray Gano sees current events as a confirmation of the Book of Revelation s predictions and is preparing to face the divine fury of God.

Settled 2,500 years ago, the Nan Madol site is a living memorial to the prehistoric Micronesians that once inhabited Pohnpei. 100-feet high basalt structures rise from the deep waters to form artificial islands serving as ritual, trade, and hierarchical centers. Deep below the surface, ancient lore proposes that underwater tunnels connect this complex and are filled with untold riches and ancient artifacts. With only canoes and crude tools, how did the Micronesians build this imposing fortress? Where did they quarry these raw materials? Do the tunnels exist as an answer to the secrets of this complex network of civilization and tradition? And can we find them? Join veteran divers John Chatterton and Richie Kohler as they investigate this underwater mystery.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

As temperatures rise, a global meltdown has begun. From the Andes to the Himalayas to the Alps, glaciers are vanishing. In Antarctica and Greenland, vast ice sheets are turning into liquid. The melting ice, running off land, is raising sea levels. As sea levels rise, oceans throughout the world are also becoming hotter. Warmer seas fuel more intense hurricanes. Already, major catastrophes brought on by the process of melting ice, rising seas and intensifying storms have occurred in coastal communities around the world: the South Pacific, Bangladesh and--closer to home--New Orleans. Scientists predict that the worst is yet to come. The rising oceans may swallow some lands forever. By the turn of the century, the map of the world may need to be redrawn and a Category 4 hurricane could drown much of Washington, DC in 15 feet of water.

In 1883, Krakatoa, the most famous and feared volcano on Earth, erupted. Gigantic explosions blew the volcano to bits, which triggered massive lava flows that generated huge tsunamis. Nearly 37,000 died, the greatest death toll caused by a volcanic eruption. It could happen again. Watch as state of the art models, 3D animations and practical demonstrations show how the eruption occurred. Leading experts speculate on the impact of a mega eruption today. Would the resulting colossal ash cloud cause a worldwide catastrophe?

Was life triggered by some event, like lightning hitting a pond full of amino acids? Earth was teeming with life billions of years before the dinosaurs existed. Single-celled organisms inundated the oceans, and the soil swarmed with living creatures. Where did it all come from and how do you go from a single-celled organism to a trillion-celled organism like Man? Cutting-edge science is testing out answers about life's origins and how life can be created on new worlds--or even our own.