Sky History 2 TV Guide

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

The team uses high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon

River detectorist Beau Ouimette, TV presenter and keen swimmer Rick Edwards, and underwater archaeologist Gary Bankhead delve into the depths of Britain's watery past. Here, the trio find evidence from one of Scotland's bloodiest eras as they wade through the waters of the River Garry in the stunning Scottish Highlands

Alice Roberts meets an archaeology team in Lincoln who are looking for more evidence about a Roman occupation along a road that leaves the city. She also visits Norfolk to explore an Iron Age hillfort, discovering how 4th-century Romans used it despite being built in the Iron Age. At a small community dig in Lincolnshire, Alice learns about a newly found object - a Roman dodecahedron, and discusses its possible functions with a renowned expert in the digging tent

Documentary visiting some of the most remote, cold and inhospitable places on the planet to reveal great mysteries that have been frozen in time. A grim discovery in a Swedish lake reveals shocking ancient practices and the fossil of a previously unknown mammal is found in the Canadian Arctic

On the hunt for classic old Canadian canoes, Scott and Sheldon find themselves up the creek without a paddle. Later, they're forced to haggle with a smart teen

In 2017, it was revealed that the US Department of Defence had spent millions investigating reports of UFOs. This is the latest disclosure about a series of secret government UFO projects dating back decades, but findings have yet to be released to the public. This extended episode contemplates whether an extraterrestrial presence on Earth is part of a conspiracy

Experts take a look at the weapons dominating from the skies, focusing on the operating principles of arrows, rockets, and bombs

Events of 1941, when Hitler invaded the USSR. Plus, Operation Barbarossa stalled as winter hits and Soviet resistance - fuelled by propaganda - turned the tide

Decoding a lost civilization reveals the monumental challenge undertaken by some of the academic world's most brilliant minds

In 2017, it was revealed that the US Department of Defence had spent millions investigating reports of UFOs. This is the latest disclosure about a series of secret government UFO projects dating back decades, but findings have yet to be released to the public. This extended episode contemplates whether an extraterrestrial presence on Earth is part of a conspiracy

In September 1939 German forces invaded Poland as four Luftwaffe bomber groups attacked Warsaw. By September 6, the city's anti-aircraft defences had been reduced to a few guns and much of the Polish capital was in ruins. The bomber aircraft dominated the skies throughout the rest of the Second World War as fleets stood ready on the airfields of every combatant nation

On September 1 1939 German forces invaded Poland as four Luftwaffe bomber groups attacked Warsaw. By September 6 the city's anti-aircraft defences had been reduced to a few guns and much of the Polish capital was in ruins. The bomber aircraft dominated the skies throughout the rest of the Second World War as fleets stood ready on the airfields of every combatant nation

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain as the remorseless development of weapons and bombers

After the end of the Battle of Britain came the bombing of German cities. In the war in the Pacific, the US and Japan successfully bombed naval and land targets

How the bombing of Tokyo demonstrated the power of the B-29 bomber. The cost of creating this machine exceeded that of the Manhattan Project, which developed the first atomic bomb