There are only so many species discovered in the ocean. More than 95% of the ocean is left to be discovered. Scientists say that they don't know what species live deep in the ocean or in undiscovered territory, but they say that there should be millions of species to be found.
The color of the ocean may depend on the amount of plant life down below. A oceanologist says, "it is difficult to study down in the ocean because the pressure is like trying to support 50 jumbo jets." Yet he still tries to find a way to do so. It is hard to see because a flashlight won't shine that far and it is very cold. The water gets colder the deeper you would go, and the deep water is where they need to discover the different species.
Between 364-380 million years ago, extinction pulses wiped out 60% of marine life. And scientists assume that the dinosaur extinction was caused by an underground explosion that happened 300 kilometers below earth's surface. Yet how did this effect the ocean dinosaurs and how come they died from this? Was it the radiation? Did the explosion happen under the ocean? And why is it assumed that it was an explosion, not the common thought, an asteroid.