You're right, Steve, different ropes for climbing (mountaineering and rock climbing ropes have to stretch under abrupt dynamic load to absorb the fall shock or they would seriously harm the falling human), but caving ropes are static, non-stretch lines like Bluewater (if you tried to ascend a deep cave on a climbing rope you would be climbing until Christmas before your weight pulled out all the stretc.) And ropes used to ferry line or lower a canoe on portage would be non-stretch as well. A 200# climber falling 50' puts WAY more acute stress on a rope running through a protection point than even a loaded canoe pinned by a high volume stream would. To expand what I said before, the only way to come close to a human leader fall stress would be throwing an 80 lb canoe loaded with 120 lbs of gear off off a 100 foot cliff and arresting its fall at 50' tied to a single point. The continuous force of a pinned boat is not an abrupt dynamic shock to the rope. A hard leader fall of an average sized person puts an immediate force of over a ton on the rope and any protection equipment. This is why climbing carabiners and other gear are rated at 3000 lbs and up.
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