The fact that water makes up 70% of the Earth is common knowledge. However, did you know that oceans serve as the world’s largest source of protein, with more than 3 billion people depending on them as their primary source of protein? Not only that, according to UNESCO, an estimated 3 million shipwrecks are spread across ocean floors around the planet. More life forms exist underwater than above. And all this has been discovered only in the 5% of ocean waters we’ve already explored. (Yes, we've only explored that much of our vast oceans.)