Expedition cancellation is rare but can happen due to unforeseen logistical issues before departure (e.g., it is not possible to arrive at the departure location due to a major natural event) or guide issues close to the trip start (e.g., getting sick, or injured). During the expedition, it can be due to issues like altitude sickness or weather conditions that could force us to adjust the itinerary, though this is part of what can happen in a high-altitude expedition.