Contender has travelled thousands of kilometres along the eastern seaboard of the United States since first being tagged. Photo / OcearchContender has travelled thousands of kilometres along the eastern seaboard of the United States since first being tagged. Photo / Ocearch

Contender – the shark’s nickname – is a 4.2m great white estimated to weigh about 750kg. Photo / OcearchContender – the shark’s nickname – is a 4.2m great white estimated to weigh about 750kg. Photo / Ocearch