YouTuber describes strange sounds while exploring cave area

Rat & Cat posted a short walkabout video in Skamania, WA in an area that has a lot of caves and where 3 men had gone missing. In the video he talks about some strange noises (strange sounding woof, howl, and hoots) he had encountered in the area. He had dismissed the woof and howl until he realized there were no campers in the area. You can tell in the video that he's uncomfortable being there. Check it out here (BTW, it's a 360 video so you can look all around):