Also, weather in Alaska changes crazy fast. When I went glacier trekking the helicopter landed on the ice near this big orange tent dome. It was set up because weather could change so drastically in under an hour it was very possible they could not come back and get you in the extreme weather right a way. 3 helicopters have crashed there the year prior to my visit. Fortunately, it was a prefect day unforgettable experience. So worth it. I wish I had a drone back then.