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Old March 8th 19, 02:57 AM posted to sci.astro.amateur
palsing[_2_]
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Default NASA never expected to have to re-position its drilling probe?

On Wednesday, March 6, 2019 at 4:59:22 PM UTC-8, RichA wrote:

Ever dig in soil and hit a rock? Seems NASA didn't expect it. Pretty stupid.

https://www.bbc.com/news/science-environment-47469071


From your own link, which you apparently did not read with full comprehension...

"... But the presence of hidden rocks was always a possibility, and even expected."

\Paul A