Zero Hour

Follow the preparations in the final hour before the ill-fated Columbia Space Shuttle launch. Could anything have been done to prevent the tragedy?, An in-depth account of the shocking high school massacre from various perspectives, aided by personal accounts from those who were there., Documentary series examining pivotal events in human history., Unravelling the 1986 catastrophe in Chernobyl by examining it from four different angles, aided by the personal accounts of those who were there.