1982, 'sleeping beauty' / 'sleeping ugly' was observed sleeping / resting in a cave, not too far from the opening. The observer knew of caves in the Bear Valley area, north of Ketchikan. He was exploring the Bear Valley and Ketchikan Lake area, at Lower Ketchikan Lake. The observer quietly left the cave.
Think of South East Alaska as a sunken mountain range. The terrain is harsh. Caves would be beneficial since the area can receive more than 150 inches of rain in a year. Caves can be a trap if there is only one way in / out. Think about ventilation. A cave that slopes downward will pool up CO2 iin the low spot(s) from respiration.
I am not around caves in Washington State. I used know miners who had an operation in Eastern Washington. Hard rock activity and they excavated quite a ways. They said the temperature in their mine was about 65 degrees F year round.