That was quite a wrong turn, but who hasn't been lost? BBC:
Great white sharks in the Mediterranean may have first arrived from the seas around Australia 450,000 years ago, genetic studies have suggested.
Researchers writing in Proceedings of the Royal Society B believe the arrival may have been simply a migratory "wrong turn" by a few pregnant females.
A tumultuous climate between ice ages may have been the cause.
The species - Carcharodon carcharias - would have remained in the Med because it returns to spawn where it was born.
