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Message: <blockquote data-quote="imhotep" data-source="post: 29434267" data-attributes="member: 562115">Because it isn't easy.  The Earth’s oceans contain roughly 321 million cubic miles of water, which covers more than 70% of our planet’s surface area and amounting to roughly 99% of the Earth’s total living-space. Like NASA, the NOAA receives billion dollar funding but it's much less compared with what's spent on Space exploration and there's a limit to what they can do. Also the deep seas comes with its own risk.NASA has their own underwater exploratory vehicles too.We don't know about all the creatures in the sea. Each year many new species are found. Remember the Coelacanth (Seel-uh-kanth), the fish that was supposedly extinct?  Coelacanths are known from the fossil record dating back over 360 million years, with a peak in abundance about 240 million years ago. They were believed to have become extinct approximately 80 million years ago, when they disappeared from the fossil record.Coelacanths can grow more than six feet long and weigh about 200 pounds, and they're covered in thick, scaly armor. It's estimated they can live up to 60 years or more. Coelacanths were thought to be the ancestors of tetrapods (four-legged, land-living animals), but a recent analysis of the coelacanth genome suggests that lungfish are actually more closely related to tetrapods. The divergence of coelacanths, lungfish, and tetrapods is thought to have occurred about 390 million years ago. Coelacanths might occupy a side branch of the vertebrate lineage, closely related to, yet distinct from, the ancestor of tetrapods.Their movement of alternate paired fins resembles the movement of the forelegs and hindlegs of a tetrapod walking on land.Coelacanths retain an oil-filled notochord, a hollow, pressurized tube that serves as a backbone. In most other vertebrates, the notochord is replaced by the vertebral column as the embryo develops. Also they give birth to live young.It was rumoured that the fishermen in South Africa claimed they know this fish by the drawings and eventually a live one was found in 1938. Since then many have been found and now the scientists know where they are.Latimeria chalumnae was discovered off the coast of South Africa in 1938. The second living species of coelacanth, Latimeria menadoensis, was discovered in an Indonesian market in 1997. The Sulawesi fishermen called this fish raja laut (King of the Sea) and they knew about it's existence long before.</blockquote>

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