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The submersible dropped from the ocean's surface faster than I had expected.Within seconds, aquanaut Robert Carmichael and I were enveloped by a vibrant shade of blue, watching streaks of sunlight pierce the water's surface.This body of water is poorly studied and few scientists have ever ventured deeper than the maximum scuba depth of 30 meters.Carmichael, a veteran of the sea, relayed the information to the surface via an underwater telephone.Oceans cover over two-thirds of the Earth's surface but remain, for the most part, unexplored.Able to operate down to 305 meters, these manned submersibles give scientists a unique understanding of changes in habitats as sunlight diminishes through the different layers of ocean.Water is best kept on the outside of a submersible. Carmichael quickly put me at ease: The difference in temperature between the water around us and our submersible had created a layer of condensation on the hatch. It was curiosity that drew Carmichael to the ocean. As the oceans slowly soak up heat from the atmosphere, marine species will be affected in different ways.
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