The relationship between personality characteristics, daily stressors, and means of coping were studied in a 12-person Soviet-American expedition team consisting of Caucasian and Eskimo men and women. The members scored relatively high on scales measuring well-being, achievement orientation, and traditionalism and scored relatively low on stress reactivity. The use of social support as a coping mechanism was positively related to high stress reactivity, control, and negative emotionality and negatively related to well-being. Negative emotionality was related to ratings of daily intrapersonal stressors. Discussion centered on the function of social support in an extreme, task-focused situation and the relationship of social support coping in this particular type of situation to maladaptive personality characteristics.