How do they do that?
According to scientists there is nothing unusual and extraordinary in stories that tell us about dolphins saving people. These mammals feel the danger that threatens people and decide to protect them.
If they really save people, then we should consider the fact whether they do it consciously or just instinctively. If dolphin does it consciously, then it must realise that human being is in danger, and then they must feel the necessity to help this person. And then they have to do certain actions to save people. And some scientists think that dolphins can't have such complicated complex of knowledge, abilities and feelings.
Some scientists even say that dolphins are beasts, and sometimes people even should be careful with them. According to scientists all deeds of dolphins are simple instinctive reactions similar to reactions of many other animals of the world. And they can't even assume that dolphins may have developed intellect. According to them, only reflexes may explain pointless actions of these mammals.
But their actions are not pointless. After all helping people is not pointless deed even if you are dolphin. Scientists say that dolphins don't care what to save, appealing to cases when dolphins were pushing turtles, fragments of trees and clothes to the shore.