The swimming speed of Ophthalmosaurus has been estimated at 2.5 m\/s or greater , but even assuming a conservative speed of 1 m\/s , an Ophthalmosaurus would be able to dive to 600 meters and return to the surface within 20 minutes .
Even assuming a conservative speed of 1 m\/s , an Ophthalmosaurus would be able to dive to 600 meters and return to the surface within 20 minutes .