A great white shark called Lydia could be about to make history.
Lydia could be the first of her species to be seen crossing from one side of the Atlantic to the other.
No white sharks have ever been monitored swimming over the border of the east and west Atlantic.
A tracking device was attached to Lydia on the Florida coast in March 2013.
Since then she has travelled more than 30,500 kilometres or 19,000 miles.
Dr Gregory Skomal, a fish biologist who is monitoring the shark's path says:
"We have no idea how far she will go, but Europe, the Med, and the coast of Africa are all feasible."