>> just hoping and praying that we have options to move through here because these rapids are becoming pretty deadly. >> we hit a place where the canyon turns into a full walled-in box, and it's going to go through its very steepest section. right there, there's a part of the river that will kill you. and so we go looking up on the canyon wall for some route around this section of river that looks probably unsurvivable. >> it looks like we have at least two miles from looking at the map before we have any chance of getting back into the river. that's going to take us at least two days. >> [ bleep ]. it's so muddy, i cannot even take my throw bag.