There’s what I call “valet” cave diving in Mexico There are porters (aka scuba sherpas) that will help set up your SM tanks (I always did my own), haul tanks up and down the many steps to the water at the cenotes, and even bring your SM rig down to where you are at the water’s edge. I had a week of this while doing full cave in August. I’ll do it again when I’m there in December. I have bad knees and sciatica. It was my instructor’s way around my physical issues and it allows me to concentrate on my diving and not hurt myself hauling tanks up and down the many steps. 500 pesos/$25 a day. Porter also watches the truck when you’re diving, which is a good thing. Worth every penny.