Sky History 2 HD Tuesday

An investigation into whether Earth's deepest caves could contain secret conduits to other worlds, or harbour evidence that aliens once visited the planet

Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers

Tim Sutherland, Malin Holst and Simon Richardson investigate the discovery of barrels containing well-preserved swords on the site of the final battle of the Hundred Years War

A look at Le Cercle, which started in the post-war years as a Catholic conservative group built to broker European rapprochement. Some claim it now control world politics

How the seaside resort of La Conchita in California was rocked by a mudslide following weeks of torrential rain

An investigation into whether Earth's deepest caves could contain secret conduits to other worlds, or harbour evidence that aliens once visited the planet

Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers

The team investigates artefacts associated with Norse and Scottish clans that settled in Ireland after losing their land in the Scottish Wars of Independence

The Freemasons, whose members have been meeting since the 14th century. Its past members have included Winston Churchill and Rudyard Kipling

Dr Fern Riddell and Dr Karen Bellinger examine the Holy Grail, an object of mystery and fascination traditionally thought to be the cup that Christ drank from at the Last Supper

The ocean liner Titanic, which sank on its maiden voyage from Southampton to New York in April 1912, and the mission of two very different men to re-discover her

Professor Alice Roberts is in Glasgow to investigate the impact of steam power on major towns in the 18th and 19th centuries, and learns about the arrival of migrant workers

The secret nuclear facilities built by the US in 1939 designed to beat Hitler in the race to create an atomic bomb

Craig and space journalist Sarah Cruddas turn their attention to reports of alien abductions, focusing on a case from the UK which was reported in in November 1980

The stories behind unusual and unexplained UFO sightings, starting with an incident played out in 1952 across the skies above Washington National Airport

How Inca, Mesopotamian, Persian, Greek, Chinese, Egyptian, Roman and Indus civilisations all still exert deep influences on modern life. This episode focuses on agriculture

Sightings of unexplained 'aerial phenomena' and reports of so-called 'first contact' moments, which are supported by credible eyewitness accounts or clear video footage

Nassau comes under the control of Rogers and the era of the pirate kingdom reaches a bloody end. Narrated by Derek Jacobi

An investigation into whether Earth's deepest caves could contain secret conduits to other worlds, or harbour evidence that aliens once visited the planet

Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers

How Inca, Mesopotamian, Persian, Greek, Chinese, Egyptian, Roman and Indus civilisations all still exert deep influences on modern life. This episode focuses on agriculture

Dr Fern Riddell and Dr Karen Bellinger examine the Holy Grail, an object of mystery and fascination traditionally thought to be the cup that Christ drank from at the Last Supper

The ocean liner Titanic, which sank on its maiden voyage from Southampton to New York in April 1912, and the mission of two very different men to re-discover her

Professor Alice Roberts is in Glasgow to investigate the impact of steam power on major towns in the 18th and 19th centuries, and learns about the arrival of migrant workers

Examining the notion that the forces of inspiration the ancients attributed to the gods actually emanated from an otherworldly source