Tell us about yourself!
I would use a little more than expected, so around 40 - 50 feet of cord just in case.
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Here is the link:https://www.amazon.com/BladesUSA-MD-1BD-Diving-9-Inch-Overall/dp/B0060E82ZU/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1471211004&sr=1-2-catcorr&keywords=diving++knife
I would start with around 10-12 feet, just to make sure that you have enough cord in case you need to make adjustments.
I used a regular 5/8 buckle for this design.
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