The fast currents and big reefs of Cozumel are the big lure for divers traveling to the Yucatan peninsula, but for
bad weather days or a change of pace, the Yucatan mainland is less than an hour’s ferry ride away. There you’ll find
a totally unique diving experience: cenote diving (pronounced say-No-tay. Cenotes are sinkholes, pools of water
leading to underground rivers that have carved their way through limestone. Although the center of cenote diving is
around Akumal, a small collection of resorts, restaurants, and dive shops about 60 mi. south of Cancun, cenote
diving is being promoted everywhere, including the streets of Cancun and Playa del Carmen. They require no
specialty training to take a dive and cruise the crystal-clear waters of the pool or swim back into the mouth of the
cavern where the entrance is always in sight. If you haven’t tried it, do; it’s worth the effort.
If you find you like it, there are several ways to get past the warning signs at the end of the cavern zone. In our
  May issue, our correspondent reported on his cavern/intro cave training at Florida’s Ginnie Springs. This month’s
  correspondent goes a little further and a little deeper, opting for full cave training in some of the most extensive
  cave systems in the world.
___________________________________
Dear Fellow Diver,
By day ten of my Yucatan diving adventure, I was feeling like a veteran. My
  muscles had strengthened to where there was spring in my step as I lumbered along
  with 90 lbs. of gear hanging off my overweight torso. No, I wasn’t headed for the
  beautiful, sunlit reefs offshore: I was making my way through the jungle to a
  waterhole.  
Jumping into the Cenote Carwash with my
  guide, I did the mandatory gear check,
  then sank into the cenote and headed for
  the cave. The beginning of the cave system
  is a large, gaping cavern where my guide
  pointed out charcoal remnants of campfires  and shards of pottery left by ancient
  peoples who used the cave as a dwelling in
  prehistoric times before it flooded. The
  eerie cavern entrance is crisscrossed with
  a tangle of trees that have fallen into
  the cenote over time. We tied off our
  guideline and entered the darkness.  
Gliding through water so clear feels
  like floating in air. I concentrated on
  applying my newly-learned skills, making
  sure my legs delivered only the short,
  abbreviated kicks I’d been taught would
  minimize the “prop wash” from my fins and
  prevent silting of the passageway. As I
  ran my guideline back 350’ toward the
  “Chamber of Horrors,” my pinkie finger
  gently applied friction to the reel to
  keep the line from snarling. Then, picking
  up the permanent guideline, I tied
  off my primary reel and looked around,
  and that’s when it hit me: it’s incredibly
  beautiful in here. Swimming on past “Luke’s Hope,” a minor cenote in the system, I contemplated its namesake, a foolish,
under-prepared diver named Luke who was saved from impending death years ago when he
ran across this tiny exit out of the underwater world.
Negotiating some minor restrictions, we snaked our way back to “Crystal Palace,”
  where I moved past legions of brilliant white stalactites, soda straws, and dribbling
  flow stones. When we arrived at the “Room of Tears,” the cave opened into a large chamber
  that resembles an ancient cathedral with sculpted columns. It didn’t matter which
  way I turned; there was cathedral-like ornamentation in every direction. Although my
  MX-10 camera wouldn’t do justice to this scene, I was there absorbing every view and
  burning them into my memory.  
After penetrating 1700’ into the cave,
  we turned around, our timing based on the
  air management “rule of thirds” (use 1/3
  of your air in, 1/3 out, and surface with
  1/3 left). I picked up our reels as we
  retraced our path through the magnificent
  structure. Arriving at the juncture between
  the cave and the cavern zones, I checked my
  instruments for the log book. I’d spent 1
  hr. 50 min. in pure bliss. And I still had
  1200 psi left in my doubles.  
  
    | The Caribbean coastline between Playa del Carmen and Tulum offers the greatest concentration
 of highly decorated cave systems in the world. It’s
 estimated that close to a million feet of survey line
 has been laid since 1985. About 50 cave systems have
 been explored to date, and the two longest caves are
 competing for the title of world’s longest: Nahoch
 Nah Chich, with 215,000’ of surveyed passages, and
 Dos Ojos, with 200,000’. Exploration of new cenotés
 is ongoing, and major expeditions are organized
 regularly to push new line into the two biggest ones.
 No one thinks they’ve reached the end.
 | 
My home away from home for these 11
  cave-diving days was Aquatech/Villas
  DeRosa in the quiet little community known as Aventuras/Akumal. With no restaurants,
  bars, or stores, Aventuras is less a town than a whistle stop off the main
  drag, Hwy. #307, running from Cancun nearly to Belize. The community hugs the beachfront
  in a lovely cove along the Caribbean coast, and Villas DeRosa is the centerpiece
  of the two- or three-block long enclave. Like so many small outposts along the Mayan
  Riviera, Aventuras/Akumal will soon experience some serious growth. Construction has
  started on a mega-development projected to include about 1,000 hotel rooms/condos.
  Today it’s still an outpost, and the beach is abandoned more often than not.  
The Aquatech/Villas DeRosa complex includes several neatly arranged buildings
  constructed in the typical Mexican stucco/cement style, all bright white and sporting freshly varnished woodwork. The main
office is in the apartment that owners
Tony and Nancy DeRosa share with their
kids and their mischievous parrot, Rico,
who sneaks up on people and nibbles on
any exposed flesh.  Nancy DeRosa, a dynamic
young woman, keeps up with the
day-to-day logistics of the operation
from her massive desk in the bedroom.
Fifteen of Villas DeRosa’s units are
hotel rooms; there’s a dozen more oneand
two-bedroom condos, and a couple
luxury villas. All have mini-balconies
looking over the pool into the jungle.
Oceanview villas and condos have large
kitchen and dining areas and a spacious
sunken living room that extends into an
ample balcony/patio with spectacular
views. For a single guy whose nightly ritual consisted of studying technical diving
manuals, the $45/night hotel room was adequate: the twin beds had firm mattresses;
the room was clean and bug-free; the a/c worked well; maid service was daily; and I
had plenty of space to spread out my stuff.
Nancy DeRosa, a dynamic
young woman, keeps up with the
day-to-day logistics of the operation
from her massive desk in the bedroom.
Fifteen of Villas DeRosa’s units are
hotel rooms; there’s a dozen more oneand
two-bedroom condos, and a couple
luxury villas. All have mini-balconies
looking over the pool into the jungle.
Oceanview villas and condos have large
kitchen and dining areas and a spacious
sunken living room that extends into an
ample balcony/patio with spectacular
views. For a single guy whose nightly ritual consisted of studying technical diving
manuals, the $45/night hotel room was adequate: the twin beds had firm mattresses;
the room was clean and bug-free; the a/c worked well; maid service was daily; and I
had plenty of space to spread out my stuff.
Meal routine was simple: when you’re hungry, stroll down to the basement kitchen
  and tell the staff you’re ready to eat. Since there’s no dining room, meals can be
  served in your room, on the rooftop patio, or by the swimming pool. (The roof-top
  “La Terraza” bar, another dining spot, was closed for renovation during my visit.)
  My dinners in my room were a little lonely until I met other divers, who invited me
  to join them.  
Dinner menus varied, with baked or broiled fish three nights, chicken twice, a
  jerked beef dish, fajitas, two different
  shrimp meals, and a sensational steak wrapped
  in bacon that just melted in my mouth. Side
  dishes included rice or potatoes, at least
  one other vegetable, a salad or soup, and a
  homemade dessert. The chef specialized in
  exotic sauces: his curried chicken with rice
  was spectacular, baked fish with raisin sauce
  superb, and his delicate white sauce made
  even cauliflower taste good. I often took
  potluck and let the kitchen serve their special.  
  
    | Cave certification at Aquatech can be approached several different ways (such as 4
 two-day or 2 four-day sessions), but if you know
 you’re going to go all the way, the quickest,
 cheapest option is to do it all at once over a sixday
 period. The 600 minutes of bottom time is
 grueling, but the class begins with double-tank
 training, skipping the single-tank training
 usually offered in cavern and intro courses. The
 course fees include all specialty equipment
 (except primary lights, which can be rented),
 such as: doubles, backpacks, wings, reels, long
 hose regulators, etc.
 | 
The kitchen didn’t open till 8 a.m.,
  which made getting all the divers fed, downstairs,
  and loaded up for the day’s diving
  somewhat of a rush. My breakfasts were usually
  eggs and toast served poolside, and my giant sub sandwich lunches were eaten
  out in the jungle between dives. On the days I lunched at the resort, enchiladas
  and a hamburger platter were offered.  
 And he’s a hAquatech’s training operation is anchored by an almost-legendary cave instructor,
  Steve Gerrard, who’s been teaching cave diving since 1981 and has certified
  over 1300 cavern and cave students. A past President of the National
  Association of Cave Divers (NACD), he’s one of the more experienced cave divers in
  Mexico.ell of a nice guy. His laid-back training style was thorough,
  but not at all like the drill sergeant he was once reputed to be. Although Aquatech offers reef dives, fishing trips, and a full spectrum of tourist activities, their
focus is on cave diving (they claim to service 85% of the area’s visiting cave
divers). All ten of the principals on staff are certified cave-diving instructors
or divemasters who regularly explore. The four I dived with were friendly, professional,
safety-conscious, and ecstatic about cave exploring.
I came to Aquatech a novice, a purebred open-water diver with nary a shred of
  cavern-diving experience. They paired me with a British cavern diver, and, as the
  days progressed, we fell into a routine of gearing up around 8:30, grabbing two
  sets of doubles, and taking off for an intensive four-dive day. Lectures were presented
  during surface intervals, on the road to the dive sites, and occasionally at
  night back at the resort. Our first and third dives, conducted with full doubles,
  were our deepest and longest penetrations, dives two and four shorter ones using
  our remaining air for skills drills. I logged 704 minutes of bottom time during 15
  dives in five days of training.  
Although most cenotes run with crystal-clear water that gives you the giddy
  feeling of floating in nothingness, in some places the cave system runs close to
  the surface and picks up brown, tannin-soaked jungle waters. These dark, low viz
  waters can stain entire cave systems a dirty brown and obscure spectacular formations.
  Marine life is conspicuously absent from most cave dives; however, there’s
  usually a thriving marine ecosystem in the open bowl of the cenote. At Cenote
  Nahoran, large box turtles cruised in and out of the aquatic grass. As we bobbed on
  the surface at Carwash, my earlobes were regularly assaulted by schools of Yucatan
  tetras and an occasional Jack Dempsey. At Cenote Vaca Ha, Steve called his dog in
  from the swamp because a week earlier his wife had seen a small crocodile there.
  During deeper penetration cave dives, I ran across several blind Yucatan cave fish
  and a couple of remipedes, small white centipede-like creatures.  
Why train extensively for dives that you can only do at a few places in the
  world? There are reasons beyond the spectacular formations you’ll see. Having seen
  a lot of reefs, cenote diving takes on new challenge and mystery. It’s an excellent way
  to develop self-sufficiency as a diver. And, although I didn’t venture into any unexplored
  territory, I certainly got a feel for what the explorers are into. There are few
  destinations left where you can actually be the first one to enjoy the view.  
If you’re vacationing in Cancun or diving Cozumel, a day adventure in a cenote
  is still a treat. Not only is it totally unlike reef diving, it’s also a way to get
  wet in bad weather, a quiet retreat from hectic Cancun, and an other-worldly experience
  to add to your mental log book.  
— X. P.  
 Diver’s Compass: If you’re coming from Cozumel, catch the ferry
  downtown to Playa del Carmen, where several dive operations on
  Fifth Street or along the beach offer cenote dives. Most are
  within an hour’s drive of Playa...In Cancun, cenote dive options
  which include transportation to the Playa/Akumal area are marketed
  by most dive operators or hotels...To contact Aquatech/
  Villas DeRosa: phone 52-987-59020, website www.cenotes.com.
  Rooms $45-$200 (varies w/size and season). Packages for cavecertified
  divers including airport transfers, full meal plan, 7 nights accommodation,
  and six days guided diving start at $850/person for groups; full
  cave-training packages w/room and board run $1400 (6 students) to $2075 (private);
  many technical courses and private cave tours offered...Mostly aluminum 80s, some
  steel 85s, 95s, and 104s, Nitrox available...10% tax on almost everything...Water
  temps 76-79 year-round, viz as high as 300’; air temps 80-85 mid-November...C-cards
  and log books checked...Cokes were free, local rum $2.50/liter in Tulum...
Diver’s Compass: If you’re coming from Cozumel, catch the ferry
  downtown to Playa del Carmen, where several dive operations on
  Fifth Street or along the beach offer cenote dives. Most are
  within an hour’s drive of Playa...In Cancun, cenote dive options
  which include transportation to the Playa/Akumal area are marketed
  by most dive operators or hotels...To contact Aquatech/
  Villas DeRosa: phone 52-987-59020, website www.cenotes.com.
  Rooms $45-$200 (varies w/size and season). Packages for cavecertified
  divers including airport transfers, full meal plan, 7 nights accommodation,
  and six days guided diving start at $850/person for groups; full
  cave-training packages w/room and board run $1400 (6 students) to $2075 (private);
  many technical courses and private cave tours offered...Mostly aluminum 80s, some
  steel 85s, 95s, and 104s, Nitrox available...10% tax on almost everything...Water
  temps 76-79 year-round, viz as high as 300’; air temps 80-85 mid-November...C-cards
  and log books checked...Cokes were free, local rum $2.50/liter in Tulum...