Home to the legend of the Loch Ness Monster, this lake holds more water than any other lake in Britain. It's only 10,000 years old, but billions of years in the making.

The tale of the tricky and somewhat lovable leviathan that has eluded 11 expeditions.

The Loch Ness Monster may be the world's most famous unidentified species. Is it simply a legend, or could it be much more?

The Loch Ness Monster may be the world's most famous unidentified species. Is it simply a legend, or could it be much more?

The Loch Ness Monster is one of the world's most enduring mysteries. But there have also been accounts of similar cryptids all over the planet. Sightings of these mysterious creatures have been documented for hundreds of years in various cultural folklores. Are these fantastic creatures leftover dinosaurs, mythical animals, or something that traveled to Earth millions of years ago? Or might the sightings of these strange beasts be a glimpse into the past caused by a disturbance in the space-time continuum? Ancient Astronaut theorist Giorgio Tsoukalos travels from the Highlands of Scotland to the shores of Vermont's Lake Champlain in his quest to learn more about these elusive lake monsters. Could there be a link between two of the most famous creatures in the world--Nessie and Champ? Is there a correlation between the geology of their locations? And what surprising role might physics play in understanding just what eyewitnesses claim to have seen?

The search for the Loch Ness Monster has captivated the world for decades, but now a startling realization about "Nessie" might shatter this age-old myth. Could the Loch Ness Monster be dead, and do its remains lie hidden at the bottom of the lake? Robert Rines, a world renowned inventor, believes he may have seen the remains of this mythical beast and is on a mission to find evidence to prove it. Rines, who believes he saw the creature surface in the lake in 1972, caught sonar images of the monster's remains. He believes Nessie's death may explain the decrease of sightings in recent years. Our search team looks for evidence and deploys the latest technology including remote operating vehicles (ROVs) and sonar and underwater cameras as it goes on the ultimate search for Nessie's remains.

Does a giant prehistoric creature lurk in Lake Champlain? Locals call it Champ. Generations of eyewitnesses rumor to have seen the creature, a dinosaur-like animal, 15-25 feet long, most resembling the extinct plesiosaur. Examine the mystery surrounding Lake Champlain as specially designed cameras search for the monster. Existing photographic evidence will also be put to the test.

Join divers, biologists and forensic sketch artists as they team up to search for "Cressie," the mysterious creature allegedly lurking at the bottom of Lake Crescent in New Foundland. Native American legends date back centuries and refer to a "Pond Devil" and a "Swimming Demon." There have been recent sightings by witnesses who describe seeing a strange oversized eel. Discover what the evidence reveals as scientists use the latest hi-tech equipment to get to the bottom of Lake Crescent.