In this paper, we present different types of technologies and their characteristics for underwater communication. With the world progressing with the speed of light, man has conquered the Earth, sky and now he has reached undersea to explore the world underneath. The underwater world presents us with many obstacles and complexities. The complexities include multipath fading, time variations, the motion of the water itself. The emerging technologies like Blue-Green Lasers are finding their ways to replace the conventional acoustic communication thus reducing their drawbacks.
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