Sky HistoryHD

WWII was a world arms race where scientists and engineers built powerful weapons and machines that reshaped warfare and influence modern life.

Dr Alice Roberts explores finds from the west of Britain, including the lost World War I training trenches on Salisbury Plain.

..For a Locker!: Ivy goes up against an upstart buyer in California, while Lisa gets more than she bargains for while angling for a smaller unit.

Brandi lets Danielle lead the way in California, and their bargain purchase is a trip. Also, Rene takes a gamble on interesting packaging.

.. If You're Nasty: Brandi shows up in Riverside, dressed to distract. Meanwhile, Rene bites off more than even he can chew.

A small animal catches Lisa off guard, while Ivy and Isaiah barrel their way through a unit, leaving them in need of a drink.

Kenny tried to bribe the competition in Canyon Country, Ivy and Isaiah make the most of a purchase and Brandi takes on the power of darkness.

Rene goes head-to-head with Darrell, while Lisa and her dog sneak their way into a locker that earns her stamp of approval.

The German invasion of Poland starts and Jews face segregation. Mussolini allies with Hitler, Churchill is appointed UK PM and Germany invades France.

Germany builds its empire in Europe, aiming to crush Britain with the Luftwaffe while France is conquered and divided as Churchill rejects peace.

By June 1941, Hitler controlled most of Europe, but the USSR resisted invasion. Then Pearl Harbor changed everything.

After the attack on Pearl Harbor, the Japanese army celebrated its victory. Four months later, the Battle of the Coral Sea shakes their confidence.

At the beginning of 1942, war wages on the battlefields in Eastern Europe, North Africa and Asia Pacific.

From Burma to China and war-torn Europe, battles rage on as Japan pushes in Asia and Hitler renews his assault on the Soviet Union.

As Soviet forces push back, Goebbels calls for total war amid the devastation of German cities from Allied bombers.

A Soviet offensive pushes German forces 30km from the Polish border. On June 6, 1944, Operation Overlord is launched against Germany.

From Everest's frozen secrets to a Bronze Age ship carving, a whale graveyard and a lost human lineage, remarkable discoveries emerge.

Home to mysterious stone circles, stories of strange beings and reported sightings, Scotland has always been an epicentre of otherworldly phenomena.

From Stonehenge to crop circles and UFO sightings, Britain holds many mysteries. Has this island been a destination for alien visitors throughout history.

Earth's oceans hide ancient legends and rising UFO activity across their depths. Could the deepest waters of our planet hide otherworldly life.

Bradley Walsh investigates baffling UFO encounters in Britain and the US, meeting eyewitnesses and experts as he asks. Are we really alone? (1 of.

After four years of horror on the battlefield, the Allies are in danger of losing to Germany. General John J Pershing races to train the untested American Army. (1 of.