The STRANGE DEEP Hole on Mars That NO ONE Can Explain

What do you think caused this massively deep hole?

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References:
https://www.sciencealert.com/nasa-doesn-t-know-what-made-this-deep-hole-on-mars
http://www.natureworldnews.com/articles/38344/20170606/nasa-discovered-a-strange-deep-hole-on-mars-where-did-it-come-from.htm
https://futurism.com/10-science-mysteries-waiting-solved/
http://www.newsweek.com/giant-hole-mars-has-nasa-scientists-confused-621031
https://en.wikipedia.org/wiki/Mars_Reconnaissance_Orbiter
https://en.wikipedia.org/wiki/Mars