National Geographic: Situation Critical

In war-torn Sierra Leone in 2000, thousands of armed rebels lived in the jungle. When members of the Royal Irish Rangers were ambushed and taken hostage, the British government launched a risky and grueling rescue mission.

Two days after Apollo 13's launch, an oxygen tank on board burst and the situation became perilous—200,000 miles (321,868 kilometers) above Earth. Personal accounts bring one of the most famous space rescues in history to life.

In 1995, U.S. Air Force Cpt. O'Grady was patrolling the skies above war-torn Bosnia when a Serb missile hit his fighter jet. Upon impact, O'Grady was safely ejected, but his parachute sailed into hostile territory and gunmen were on his trail.

The 54th Sydney to Hobart yacht race turned into one of the worst sporting disasters in history. Almost 100 vessels faced brutal 90-mph winds and towering 60-foot waves. Hell on High Water revisits the tragedy and analyzes the ferocious storm that left six sailors dead.

In the 1980s and 1990s, Pablo Escobar made billions as one of the world's biggest drug dealers. The U.S. backed a massive manhunt to bring Escobar to justice. Retrace the effort to assassinate the most feared man in Columbia.

On October 23, 2002, a group of rebel terrorists enter Moscow's Dubrovka Theater. Russian officials struggle to save the hostages without surrendering to terrorist demands. Hear firsthand survivor accounts and find out how a secret weapon ended the perilous standoff.

On June 27th, 1976 a routine flight from Israel to Paris carrying 258 passengers becomes the target for a gang of International terrorists. With the lives of so many hanging in the balance the world watches breathlessly, waiting to see how the story will unfold.

A Russian Navy mini-submarine is on a secret mission in North Pacific. In the gloom, hundreds of feet below the surface, it accidentally becomes entangled in a discarded fishing net. A desperate race against time begins. Will the rescuers find the trapped crew dead or alive?

In March, 2002, Navy SEAL Neil Roberts prepares for a nighttime mission in Afghanistan as part of Operation Anaconda. Robert's Special Forces unit prepares to fly deep into enemy territory. Outgunned and outnumbered, they face a desperate struggle for survival.

On July 24, 2002, a routine mining excursion in Somerset, Pa., goes terribly wrong when a miner accidentally drills into an abandoned mine. Sixty million gallons of water is unleashed onto the miner and 17 of his co-workers. The situation turns critical as the men struggle to escape the floodwater. Nine are able to make their way out quickly, but the others are stranded and must fight the rising water level for more than 70 hours. Follow along as NGC breaks down the amazing story of survival.

In May, 2002, nine climbers tumble into a gaping crevasse in Mt. Hood, Oregon. As one man crashes into another on the slopes, three are killed instantly. A rescue helicopter approaches but loses power in thin air, crashing into the ground. Now both climbers and rescuers need help.