I was thinking that too, I used to have a Hobie Cat. I turtled it two times (not tipped it over; "turtled" is being completely inverted), and righting it was no small task and took some serious planning for wind and water flow direction, but it has a HUGE sail too.
However, if the trunk with the flint happened to go first over the non-rigger side, and everyone was hanging on that side of the canoe looking for the box, then even without a large wave added to the mix a tip-over isn't out of the question.
They have to be picking these people based on a double digit IQ limit.
just marking for review