Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Stories from the front lines of the world's bloodiest conflict as told by soldiers and civilians.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

Delving into the heart of the Second World War through sensational firsthand accounts of the hostility and heroics that dominated the defining conflict of the 20th century.

A century after the war was fought, this five-part series explores whether or not World War I could have been avoided and how people endured the battles for four years. The program uses more than 500 hours of colorized, archival footage -- much of which has not been seen previously -- to tell the story of the worldwide conflict on a human level. Viewers are transported into the heart of battle -- in countries that include France, Russia and Palestine -- and inside the day-to-day lives of civilians behind the front lines.

Stories of some of the greatest and deadliest submarine patrols of World War II.