The Nazi Prison Escape Tunnel

Iran and North Korea have them, as do drug smugglers. How grave is the danger?

Paul Keim of Northern Arizona University answers questions about microbial forensics, global plagues, and more.

Author James Bamford answers viewer questions about the National Security Agency, the 9/11 attacks, and more.

Eleanor Hill, who led congressional hearings on the attacks, discusses pre-9/11 intelligence failures in this interview.

George Orwell's secret police have nothing on two new National Security Agency systems designed to read people's minds.

A University of Pennsylvania lab is developing tiny drones that sense their environment.

Meet a new breed of flying robots, from tiny swarming vehicles to giant unmanned planes.

What happened to American pilots shot down over Korea half a century ago?

The stealth attack of Pearl Harbor by Japanese midget submarines is a little known story of WWII.

With 3D graphics, NOVA reveals how the Allies used special aerial photos to deal a dire blow to the Nazi rocket program.

Explore a marvel of Japanese WWII technology, the largest battleship ever built.

A 3-D model offers a detailed look at the tiny submarine that carried torpedoes into Pearl Harbor.

Relive the Japanese battleship's last moments as American warplanes made their fatal attack.

Once, plague-infested corpses were catapulted over castle walls. Today’s version might be an engineered "superplague."

A surveillance-image specialist analyzes photos of Afghanistan, Iraq, North Korea, and other political hotspots.

Hear how the wreck of a midget submarine found outside the harbor may rewrite the history of the Japanese attack.