The U.S. assault on Okinawa was met with an eerie silence.

Investigators are puzzled by the rapid descent of North Link Air Flight 5719, prior to its crash on December 1, 1993. Could ice accumulation have played a part in this terrible tragedy?

Could a cockpit recording reveal why Flight 5719 lost altitude? (2:54)

It's July 17, 1996 and a Boeing 747 is in the early stages of its journey off the coast of New York. Suddenly, a powerful explosion in the mid-section of the plane sends TWA 800 plummeting into the Atlantic.

TWA Flight 800 explodes over the Atlantic near New York (3:07)

Captain Marvin Falitz was widely documented to have displayed some troubling anger issues throughout his service. But did they play a part in the crash of North Link Air Flight 5719 on December 1, 1993?

Did this pilot crash Flight 5719 out of anger? (3:20)

Investigators suspect the cause of the July 17, 1996 crash of TWA Flight 800 was an exploding fuel tank. But to find out why the fuel became hot enough to ignite, they'll need to re-create the exact flight conditions.

How air conditioning caused TWA Flight 800 to explode (3:59)

It's 1977 and the Pentagon has just launched a top secret pilot program. Its purpose: to train U.S. fighter forces in air-to-air tactics against the Russian-made MiG fighter plane.

This secret program helped U.S. pilots defeat MiGs (2:26)

When the lunar module starts guiding Apollo 11 in the wrong direction, experienced astronaut Neil Armstrong has to take manual control and fly the module down to the surface of the Moon.

The Moon landing was a disaster...almost (4:25)

It's January 1991 and a USAF pilot is in trouble. An Iraqi MiG has locked on to his plane and is preparing to take him down. The next decision he makes will have to be perfect—or it could be his last.

The intense dogfight between a U.S. pilot and an Iraqi MiG (3:36)

According to the Nazis, the origin of Nordic people could be traced all the way back to Atlantis. To support this dubious claim, no less a figure than Heinrich Himmler sent out teams of archaeologists to dig up proof.

How the island of Atlantis played a central role in Nazi beliefs (3:41)

On May 18, 1980, Mount St. Helens became the largest and most destructive volcanic eruption in U.S. history. By the end of its cycle of fire and fury, 57 people had died.

Footage of the 1980 Mount St. Helens eruption (3:47)