We know more about outer space than we know about our Earth,...

We know more about outer space than we know about our Earth, ... Talking to the real people, the cave divers who do a lot in the West Isles, they truly are Earth's astronauts. They're out there exploring Earth and trying to find new places that nobody's ever seen before, and it's pretty amazing. What they've done in the last 10 years is groundbreaking.