There is a huge BASE jumping thing where I live. The cliffs looking down over the fjords are between 650 m and 1300 m and drop straight down, so there are lots of places for people to jump. Many of the BASE videos I've seen (haven't watched this one) are filmed here. There are even some of the "wingsuit" vids. One I recently saw included a crash, though the guy wasn't hurt as badly as he could have been. He was airlifted out with two broken legs and a broken collarbone. Yes, they do remind me of flying squirrels.