DiveLikeAMuppet
Contributor
4-5 millimetres? Think netting on lost lobster pots. I suspect the ceramic blades are quite brittle and fishing gear gets covered in all kinds of growth underwater. Steel EZcutter worked as did trauma shears (both covered in silicone greaseHow thick is too thick? Asking because I have a ceramic cutter too …

For really thick ropes, serrated knife and a lot of patience or diagonal/wire cutter.