In the last chapter we learned that being drowned by dragging on our tethers or badly hurt by fall-arrest shock loads (most likely a combination of both), is probably at least as big a threat as going overboard untethered and not being picked up.
In this chapter I’m going to apply a bit of simple arithmetic rigour, backed up by testing, to common jackline systems, and particularly the ones we have used on Morgan’s Cloud, and see if said systems will keep us out of the water—something I should have done years ago.