Just to add to Bob's report: My boat was more than broached on a rock, it was pinned between two rocks, one at each end, with one end wedged into something, and the whole boat rapidly filling up with water. I got out of the boat onto one of the rocks. Nathan maneuvered his boat into a nearby eddy, parked his boat on another rock, & by steadying himself on my boat was able to wade into position to help. We then flagged down a couple of rafting guides who also helped, and the whole group somehow managed to free the boat, but only after I watched it slowly buckle. Andy was a little downstream of us and caught the boat, and a rafting guide in a small raft with oars delivered me to the boat. I thought for sure I'd need to hike out and then to buy a new boat, but Andy assured me that once we got the canoe to shore I could jump up and down in it and it would be fine. Sure enough, on shore I got in the boat and stood on the part that was buckled, and the whole thing went back into position. There are some pretty impressive creases in the boat, but it's dry, and I've been assured that it's fine to paddle. Kudos to Royalex. Kudos also to Nathan Kutz, who had the paddling skills to maneuver his boat to a position where he could help, and the presence of mind to do all the right things--impressive for a first year paddler!