It’s the only deep-diving research submersible in the United States, and nearly 50 years after its first expedition it’s getting an upgrade. Take an exclusive tour of the Alvin submarine, and see how the updated vessel is continuing to push the boundaries of deep-water exploration

These skydivers are no ordinary adrenalin junkies. In the National Championships of Canopy Piloting competitors fly swoop in inches above the ground at close to 100 miles per hour. It’s an extremely technical sport that punishes any tiny mistakes.

Marine biologist Shanee Stopnitzky is on a mission to spend as much time under the ocean's surface as possible. To achieve her goal, she bought two used and broken submarines, and is fixing them up, making them functional again, learning as she goes.

This week we hear stories on how the sloshing of Earth’s core may spike major earthquakes, carbon monoxide’s role in keeping deep diving elephant seals oxygenated, and a festival celebrating heavily researched yet completely nonsensical theories with Online News Editor David Grimm. Sarah Crespi interviews staff writer Jocelyn Kaiser about the status of gene therapy, including a newly tested gene-delivering virus that may give scientists a new way to treat devastating spinal and brain diseases. Listen to previous podcasts.    [Image: Robert Schwemmer, CINMS, NOAA; Music: Jeffrey Cook]