If you are looking for an extreme sport that is both dangerous and rarely tried, the following activities may attract you: 1. **Wingsuit Skydiving**: This sport requires skydiving from a high altitude while wearing a special wing suit that can glide in the air at very high speeds and is relatively risky. 2. **Extreme Skiing**: Skiing on steep and rugged slopes, usually in undeveloped areas. This sport requires extremely high skiing skills and is relatively risky. 3. **Caving or Spelunking**: Exploring underground cave systems, which may face narrow spaces, slippery environments, and uncertain weather conditions, is very challenging and risky. 4. **Surfing (Big Wave Surfing)**: Surfing in super-large waves (usually 6 meters and above). Although surfing itself is popular, there are relatively few surfers who face big waves, and the risks are also high. 5. **Freeride Mountain Biking**: Riding in extreme natural environments, such as steep slopes, rocks, and obstacles, requires high skills and is risky. Whatever sport you choose, make sure you train under the guidance of an experienced professional and take the necessary safety measures. Always prioritize your own safety and health.