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The scoop on the end of the robotic arm dug a scoopfull of soil. It then moved the scoop over the top of the dome, and tipped the scoop to release the soil, which trickled down the dome to the base of the seismometer. Repeat 4 or 5 times. This buried several inches of cable, nearest the seismometer, to a depth of just a few millimeters.

Source: Examining the InSight raw images

buried cable

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    $\begingroup$ less glamorous than I'd thought; it seems that the last mile problem hasn't yet been solved on Mars $\endgroup$
    – uhoh
    Apr 2, 2021 at 6:45
  • $\begingroup$ It makes one wonder whether the effort to consider the issue, design a solution, manufacture a means of achievement, send it to Mars & then to undertake the endeavor was worth it. Just to put a few millimeters of soil on a cable as weather protection. $\endgroup$
    – Fred
    Sep 14, 2021 at 16:27

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