This year has set a record for shark encounters captured on camera, from a hilarious moment when a shark slaps a fisherman in the face to the intense 10-minutes a great white stalked a kayaker… these are craziest moments of when sharks strike back. 

In South Africa, two people are killed by great whites near the eastern cape, an area that hasn't seen an attack in decades. Scientists worry it could be the start of a series of attacks eerily similar to Black December in 1957, when six people lost their lives. Ryan Johnson, Gibbs Kuguru and Andy Casagrande head out to investigate the cause behind the spike in attacks before there's another fatality.