Réunion Island, some 400 miles east of Madagascar, is one of the highest-risk locations for shark encounters in the world. Surfing there is illegal except for two small, netted areas, patrolled by a small team of shark spotters known as Vigie Requin, or Shark Lookout. Meet Nelly Guichard—the only female shark spotter on this squad—as she braves dangerous conditions to help keep surfers safe.