I happened across this interesting story on the website Airfactsjournal.com titled

.
“A white knuckle flight – even for an Alaska bush pilot “

Interesting reading.

Link: A white knuckle flight – even for an Alaska bush pilot

Flying "6 feet above [the house sized rocks]" at 140 mph and with only a very small target of clear and a low ceiling above with BIG mountains close by on either side has to be attention grabbing.