"caused by its own terrain mapping equipment, which sometimes drags a line behind it as the seafloor is measured"...
Hard to imagine; they'd need to be "dragging" across 2 vectors. And the artifacts just happened to cross in neatly compartmentalized rectangles forming, if cut in half from top to bottom (at least from this orientation), a larger near-mirror-image enclosure?
They get a bunch of the google earth maps from government satellites. Must have some kind of "what if we find this or that" confidentiality clause there. I know this is quite different, but...
Sure, it is HUGE. But I'm not ready to close the book on this one...
