1. Base jumping - Base jumping is considered one of the most dangerous sports because of the high risk of death or serious injury from a fall. The sport involves jumping from a fixed structure, such as a building, bridge, or cliff, with a parachute.

2. Free solo climbing - Free solo climbing is dangerous because it involves climbing extremely high cliffs or rock faces without any ropes or safety equipment. Any misstep or fall can result in death or serious injury.

3. Big wave surfing - Big wave surfing is considered dangerous due to the unpredictability and power of ocean waves, which can reach heights of up to 100 feet. Surfers are at risk of drowning, being swept away by strong currents, or being crushed by the force of the wave.
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