An echo sounding representation of a newly discovered canyon under the Red Sea. (Image courtesy of Royal Navy/MOD.)

In this age of satellites and search engines, you would be justified in thinking that every corner of the globe has now been mapped out—and this is largely true for the Earth’s terrain. However, the deep seas continue to elude us—only about a fifth of Earth’s ocean floor has been mapped to modern scientific standards. In other words, after years of concen…

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