Intrepid Canadian mariners are selling thousands-year-old ice to craft water bottlers and high-end vodka producers.

Photographer David Doubilet first dove below the surface at age 8 and has spent a lifetime making underwater images. He talks to NPR about his new book: Two Worlds: Above and Below the Sea.

For every bit of the iceberg above the water’s surface, there’s ten times more below, Meijers said.

For every bit of the iceberg above the water’s surface, there’s ten times more below, Meijers said. It’s not exactly high-speed action.

For every bit of the iceberg above the water's surface, there's 10 times more below, Meijers said. It's not exactly high-speed action.

The world's biggest iceberg — a wall of ice the size of Rhode Island — is lumbering toward a remote island off Antarctica that's home to millions of penguins and seals.

For every bit of the iceberg above the water's surface, there's 10 times more below, Meijers said. It's not exactly high-speed action.