It's been a few years now since my cave diving there. I'm glad to hear that things got straightened out.
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For many people, there is a fear of their luggage (and everything in it) being lost. Unfortunately, by trying to pack it in your carry-on, you had the same effect - you lost your gear. The difference is that when security confiscates it, you have lost it forever. When an airline loses your luggage, it usually (not always, but usually) shows up a few days later. (JetBlue lost my luggage so often when I was flying into Syracuse that their delivery guy eventually knew where I lived.)I always carry on all my scuba gear when no direct flight. A lot of money tied up in gear, regulators, computers, etc. I know I will not carry it on again to keep from happening in the future. I was just curious if this is uncommon for the community... especially Cozumel. I was there in December 2021 and January and carried the exact same contents in my carry on. No issues.