A very talented diver and dive equipment designer, Enrique Alvarez, told me it's very simple: On the chain, place a shackle, run a 2" SS ring thru the shackle. Run the sisal line thru the SS ring, leave it free to move. Tie either end of the sisal onto the wreck in appropriate positions. Now, the sisal slips back and forth thru the ring, and the stress remains even on both ends of the sisal tie points. This sounds over simplified, as there is timing involved, to tighten the stress on the sisal at intervals to take the stress off the chain, so it solely rests upon the sisal rope. At the end of dive operations, the chain around the wreck is removed, and clipped upon itself with a carabeaner, This method should work unless there is a 180 degree shift in current direction. If a true second sisal line is wanted, then repeat as above. There are many ways to skin a cat, but I think my friend has something here, to all you mates out there...
Dive safe and often.....
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