In a leafy suburb near Tampa, Florida, on February 28, 2013, a giant hole opened up under the bedroom floor of Jeffrey Bush, swallowing him as he slept. His body was never found. Bush was a victim of a sinkhole-a worldwide hazard that lurks wherever limestone and other water-soluble rocks underpin the soil. When carbon dioxide from the air dissolves in rainwater, it forms a weak acid that attacks soft rocks, riddling them with holes like Swiss cheese. Sinkholes can occur gradually when the surface subsides into bowl shaped depressions or suddenly when the ground gives way. These geological hazards have swallowed highways, apartment buildings, horses, camels, even golfers, with monster-size holes cracking the earth from Siberia to Louisiana. Filled with compelling eyewitness video of dramatic collapses, and following scientists as they explore the underlying forces behind these natural disasters, NOVA travels the globe to investigate what it's like to have your world vanish beneath your feet.
s42e01 - Vaccines Calling the Shots
s42e02 - Rise of the Hackers
s42e03 - Why Planes Vanish
s42e04 - Surviving Ebola
s42e05 - Ben Franklin's Balloons
s42e06 - First Air War
s42e07 - Bigger Than T. rex
s42e08 - Emperor's Ghost Army
s42e09 - Killer Landslides
s42e10 - First Man on the Moon
s42e11 - Big Bang Machine
s42e12 - Sunken Ship Rescue
s42e13 - Sinkholes-Buried Alive
s42e14 - Colosseum - Roman Death Trap
s42e15 - Petra - Lost City of Stone
s42e16 - Hagia Sophia: Istanbul's Ancient Mystery
s42e17 - The Great Math Mystery
s42e18 - Invisible Universe Revealed
s42e19 - Nazi Attack on America
s42e20 - Lethal Seas
s42e21 - Chasing Pluto
s42e22 - Nuclear Meltdown Disaster
Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.