I liked that bit with Grylls, too...but I suspect much of it was faked.
There’s no way Ferrell’s agency would let him rappel down a sheer cliff suspended only by a tree branch buried in snow...I suspect those scenes were all staged, as Grylls has been wont to do, with ropes, supplies and food to get him through those two days safely.
It was fun to watch, though!
Ed
Yes, it would be fun to watch him go out with Survivorman.