John Priscu on the challenges and opportunities on reaching Lake Vostok

Transcript follows:

IRA FLATOW, HOST:

This is SCIENCE FRIDAY, I'm Ira Flatow. Think of Antarctica as the world's largest ice cube. Ninety percent of the world's ice is locked up down there. But Antarctica is also home to one of the fastest-warming spots on the planet, the Antarctic Peninsula. That's the tip that points towards South America.