Now in an incredible summer of exploration, Mark is going to tag tiger sharks of the Aliwal shoal with satellite and acoustic tags.

• 今次鲨鱼专家以身犯险，竟然无惧死亡的威胁，胆敢于虎鲨身边徒手潜水，跟虎鲨作零距离接触，希望有助了解这海中杀手。