Great white sharks are no longer a common sight in South Africa, leaving researchers puzzled

It's a bumpy ride across the cool waters of Gansbaai, South Africa, for renowned shark expert Sara Andreotti. The area was once the shark capital of the world, but now the apex predator, which has survived over 400 million years, is in deep trouble.

Four years ago, you would see five to 20 great white sharks a day during peak season. Now you'd be lucky to see that many in an entire year. Their numbers are in steep decline, and sightings of the deadly predator off the country's western cape have been dropping rapidly for the past five years. There's silence and stillness in the oceans, and Andreotti said the lack of sharks is actually an alarm.