Lengthy or shortened tubular fashionings meant to usually have something flowing through them, as we know of them here on earth anyway. Such as MARS for instance. Grant it, many of the features seen in the examples we will see in this study seem pipelike in nature.
Metallic appears again to have dominant nature of the material.
Here is the subject in question. I believe from what I remember, it is apart of the South Polar region hemisphere region. But I think I got it from one of the image dumps from that area. If any of you know what I speak about, you'll know it be like finding a needle in the haystack. So it helps the perosn much if the image number is given.