EDITORS:

Calling your attention to BC-AA--Antarctica-Tourism, which will move at 12:01 a.m. EST on Friday, March 20, the fourth in a series of multi-format stories examining the world's least known continent. The series is the product of a rare two-week journey that an Associated Press team took to Antarctica along with scientists who were looking for hints of pollution and signs of global warming, among other things.

Stories, accompanied by photos, videos and an interactive, will run in English and Spanish. In addition to tourism, the series has been exploring the strange life forms and global warming, among other topics. Along the way, we are introducing readers to some of the unique people who live and work in one of the world's most inhospitable places.

ANTARCTICA-TOURISM

KING GEORGE ISLAND, Antarctica — They trekked snow-covered mountains, gasped at melting icebergs and watched a humpback whale lunge and flap its tale. But now, this group of tourists has been stuck on a cruise ship several days, waiting for a patch of bad weather to clear. "In Antarctica, you can plan all you like, but you can't really schedule anything," goes a local saying here. The continent, perhaps tourism's last terrestrial frontier, is experiencing a boom in well-heeled visitors that some environmentalists worry could have long-term ecological consequences. By Luis Andres Henao. UPCOMING: 900 words. Photos, video, interactive.

An updated Interactive will be available Friday in the interactives/2015/antarctica folder.

The AP