It’s one of the longest rivers in the United States, and it's full of fish. Discover what is lurking in the Arkansas River.

Underwater in the Chicago River’s main branch downtown — a space not many humans, even locals, are familiar with firsthand — Tim Rooney, 57, felt the rumble of the “L” in his bones. On Sunday morning, ...

Known to some as the “Freshwater Everest,” if you want to explore this mountain, you don’t go up, you go down. In the middle of Lake Superior, near the boundary between Canadian and US waters, sits ...

PHOENIX, Arizona, May 4. TODAY'S live edition of The Morning Swim Show featured interviews with two top college coaches and an innovator in underwater dolphin kicking. In case you missed our live show ...