On a February day in 1969, off the shore of northern California, a US Navy crane carefully lowered 300 tons of metal into the Pacific Ocean. The massive tubular structure was an audacious feat of engineering — a pressurized underwater habitat, complete with science labs and living quarters for an elite group of divers who hoped to spend days or even months at a stretch living and working on the ocean floor. The Sealab project, as it was known, was the brainchild of Captain George Bond, a country doctor turned naval pioneer who dreamed of pushing the limits of ocean exploration the same way NASA was pushing the limits of space exploration. As Americans were becoming entranced with the effort to land a man on the moon, these Navy "Aquanauts," including one of NASA's most famous astronauts, Scott Carpenter, were breaking depth barrier records underwater. "Sealab" tells the little-known story of the daring program that tested the limits of human endurance and revolutionized the way humans explore the ocean.

Part two covers 1964–1968, four heady, dangerous years in the history of the space race, focusing on the events surrounding the Apollo 1 and Apollo 8 missions. As Americans moved through the 60s and reflect on the challenges ahead, many begin to wonder: What exactly is it going to take to beat the Soviets to the moon?

"Chasing the Moon," a film by Robert Stone, reimagines the race to the moon for a new generation, upending much of the conventional mythology surrounding the effort. The series recasts the Space Age as a fascinating stew of scientific innovation, political calculation, media spectacle, visionary impulses, and personal drama. Utilizing a visual feast of previously overlooked and lost archival material — much of which has never before been seen by the public — the film features a diverse cast of characters who played critical roles in these historic events. Among those included are astronauts Buzz Aldrin, Frank Borman and Bill Anders; Sergei Khrushchev, son of the former Soviet premier and a leading Soviet rocket engineer; Poppy Northcutt, a 25-year old "mathematics whiz" who gained worldwide attention as the first woman to serve in the all-male bastion of NASA's Mission Control; and Ed Dwight, the Air Force pilot selected by the Kennedy administration to train as America's first black astronaut.