Prince Harry Says William is 'Jealous' of Arctic Trek

His royal highness talks about his hike to the South Pole to support wounded warriors.
3:00 | 11/26/13

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Transcript for Prince Harry Says William is 'Jealous' of Arctic Trek
Prince harry time, now. Giving his first interview from antarctica as he treks to the south pole with wounded warriors. It is a grueling expedition. But lama hasan reports it hasn't dampened harry's sense of fun. Reporter: This morning, one final briefing before prince harry begins his final adventure. His face says it all. Looking all rugged. Speaking out for the first time since hitting the antarctic. Opening up about his sibling rivalry with his brother, prince william. It's nice to get away from charles. Reporter: He says his father is worried about harry's latest adventure. Try to keep him calm by saying the north pole is the dangerous one because you're walking on a frozen ice sheet. Apart from frostbite, you could be okay. As long as you head south. Reporter: Harry has been training for months for this grueling expedition. A three-week-long race to reach the south pole. Graf na navigating some of the harshest terrain on earth. Braving it for the same charity he went to the north pole for. Walking with the wounded, which helps injured servicemen and women. Being snowed in and all the weather delays made harry question his sanity. Me and my big mouth. There's no way I could drop out of this and no way I couldn't have done it. And also, it's a great opportunity. I know it's slightly mad. Reporter: Even joking around about trying to drop out of the trek. I broke my toe, hoping to get out of the trip. That was a massive fail on my part. Friends said, you really need to go a step further and break your leg. I chose not to. Reporter: For "good morning america," llaama hasan, london. We told you about the rain

This transcript has been automatically generated and may not be 100% accurate.

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