No, you do not have to have a C card to dive or scuba or snorkel. There is no Fedearal Scuba Agency, sorry. C cards are generally required on charter boats because their insurance requires it, there DM/Instructor insurance probably requires it and it removes some repsonsibility from the operator that your "supposed" to be certified.
No, you do not have to have any certification by law and many divers are not certified even today.
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No, you do not have to have any certification by law and many divers are not certified even today.
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