Diving is fun until your oxygen tank runs out and you die, but this Poseidon Mk IV Discovery tank actually extends the time you can be underwater by recycling your carbon dioxide exhaust and turning ...

SALT LAKE CITY – Most mornings, Velma and Helen are here in their bathing suits for water volleyball. But today, they're going bigger. While most seniors try to avoid being hooked up to an oxygen tank ...

The Hindenburg wasn't brought down by lightning, static, or sabotage. History's most famous airship was destroyed by helium. Or rather, the lack thereof. The zeppelin's Nazi builders balked at the ...

Most iPhone users are afraid to get even a drop of water near their phones, lest they one day be rejected by an Apple Store Genius. But when strapped into the iGills waterproof case, you can safely ...

Andrew Ryzebol is a professional ice diver from Canada who tells PEOPLE exclusively about his frigid adventures deep beneath the frozen surfaces of the Great Lakes he explores. The athlete shares the ...