We grapnel the wreck, take down a second line with a length of chain on it. Tie in by taking the chain around an object that is not open ended and use a stainless stell carabineer to clip back into the chain. We then send the grapnel to the surface via lift bag. When it's time to go, we take a length of the thinner sisal and make the same loop the chain did. This gives us 2x the strength of a single strand and works in most conditions for our 31' boat. If it's rough out with higher wind, we'll use the thicker sisal. This is the way I've done it for over 15 years and seems to be the safest way. At least for us. Additionally, when the first line with the grapnel is retrieved, it is immediately connected to our anchor. Should the boat break free for any reason, we will deploy the anchor to make deco for the divers easier. Lastly, we set the anchor alarm on the GPS to alert the surface guys of an issue before too much time passes. Good topic. I've always been curious about how others approach this. I can't imagine being upstream of a grapnel that is held my sisal with a lift back waiting for it to rocket to the surface if the line prematurely breaks... Be safe out there guys!
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