NOVA: Extreme Cave Diving

This program follows the charismatic Dr. Kenny Broad as he dives into blue holes — underwater caves that formed during the last ice age when sea level was nearly 400 feet below what it is today. They are Earth’s least explored and perhaps most dangerous frontiers. With an interdisciplinary team of climatologists, paleontologists and anthropologists, Broad investigates the hidden history of Earth’s climate as revealed by finds in this spectacularly beautiful “alternate universe.”

Frontline: Flying Cheap

One year after the deadliest domestic airline accident in seven years, "Frontline" investigates the crash of Continental 3407 in Buffalo, NY, and discovers a dramatically changed airline industry, where regional carriers now account for half of the nation's daily departures.

Faces of America with Henry Louis Gates, Jr.

Harvard scholar Henry Louis Gates, Jr. turns to the latest tools of genealogy and genetics to explore the family histories of 12 renowned Americans.

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