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Don't forget that Google Maps' ocean floor data is not satellite visual imagery, it is synthetic ocean floor terrain from a variety of sources, rendered to give an idea of known ridges, canyons, sea mounts, etc. Anything which looks artificial (straight lines, rectangles, etc) is almost certainly an artefact of the process used to generate the terrain model from the various data sources.
For example, side-scan sonar can give very detailed resolution when working at the appropriate range and angle, but any area which is shielded by a nearer feature will appear as a "black hole" with a very sharp cut-off from the nearer terrain which is well imaged.
There are large parts of the ocean floor where we know less than we do about the surface of Mars.
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