I was very amused to see this question stated in very practical terms for the signup to the Giant Kelp Restoration Project. Please feel free to fight amongst yourselves. For the record, I put Advanced Open Water because, while I do have Rescue, it was strictly to be a better buddy and I am in no particular shape, physical or otherwise, to be rescuing anyone.
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Alt Text: "What is your highest level of certification? Open Water, Advanced Open Water, Rescue Diver, Dive Master, Assistant Instructor, Instructor, GUE Fundamentals."