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Given the physical characteristics of Mars (the crusts thickness, it's composition, gravity, etc) how deep a trench (that could be expected to continue to exist indefinitely, or rather, for periods of time measurable in the lifespan of continents on earth) could theoretically be dug.

Assuming that the sides of such a "trench" where optimally angled for the durability of the feature.

Mars planet's crust is about 50 km

Previous question on depth for a specific atmospheric density

Edit: Comments in other questions suggest a possible hard limit of something like 30 km due to the weight of rock on that below.

So what you're saying is that at a depth of over 30 km (ballpark figure of course) the rock at the bottom of our "trench" will begin to flow & well up into the bottom of the trench until it's only 30 km deep again

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  • $\begingroup$ Good question. Just be aware that it could be years before the answer is known. But don't despair, the HP3 probe on InSight may help us find an answer! $\endgroup$ – DrSheldon Dec 4 '18 at 1:30

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