 What likely caused the most problems?
He had no stomach for mysteries, vast or trifling, and there were pressing things to think about at this time. Across to the right was a group that Baron knew vaguely—Andean climbers, or at least two of them were. I guess I was about ten when Wyatt and Carpenter made the last attempt—that was in 2082, I think. I know now that they were a pair of idiots, starting off without proper equipment, with practically no knowledge of surface conditions, without any charts—they couldn’t have made a hundred miles—but I didn’t know that then and it was a terrible tragedy. “I want to make a Crossing at perihelion and I want to cross on the surface.
 the high temperatures
 the toxic gases  the high temperatures  vehicle trouble  incorrect mapping