Bangladesh, Jan. 17 -- We might know more of the moon and have had many more astronauts walk on its surface than we do the ocean floor or scientists pacing it up and down. At least that is what Wil S. Hylton concluded in "20,000 feet under the sea," in the January 2020 issue of The Atlantic. For such a scavenging species as homo sapiens, not getting down there has not been for a lack of will, but the huge obstacles riddling the passage. First of all, we do not have the technological tools to fathom exactly what is out there, and though many billionaires have been splashing money to build the ocean-vessel to take them there (Richard Branson, for example), it has not been easy going. Second, the enormous pressure down there is sufficient to w...