These adventures can be dangerous or life threatening. Adventures in this category require special equipment, skills and training. If you do not possess the equipment and skills required find a different adventure. Mistakes and injuries can prove fatal with adventures in this category. The gravity of a mistake is serious due to the extreme conditions and the difficulty of rescue.
Significant experience is necessary.
Canyon Rating System. Hiring a professional guide to keep you out of danger or teach you the required skill is an option when considering a technical adventure. I have used Exum Utah Mountain Adventures and Jackson Hole Mountain Guides for both schooling and guides and found them very knowledgeable. Zion Adventure Company has a good reputation for teaching canyoneering skills and guiding Southern Utah canyons, I have no personal experiance with them. Be honest with yourself, these adventures will not be fun if they are beyond your skills or conditioning level.