It'd be agonizing to read or watch daily reports (if we're allowed to see them) about colonists dying of starvation, thirst or asphyxiation (or something else!), one by one until the transmissions simply stopped. I know these are the risks but that doesn't lessen the dread when it happens.
One thing that reminds me is The Lady Be Good, a WW2 plane crashed in the Libyan desert. A few of the crew members wandered off. The co-pilot's last diary entry is kind of chilling (http://ladybegood.net/diaries/index.htm): " No help yet, very (unreadable) cold nite."