Even after 50 years of flying probes to Mars, it is a battle every time to have one arrive safely. More often than not Earthlings lose.
Even if the engineering is perfect, Mother Nature has a mean streak on Mars. “The atmosphere blooms. You can get dust storms. You can get wind. We don’t have the capability to predict those things,”
Hey even if a dust storm destroys the probe at least our math is right… right? Guys? *chuckle*