The Pit (El Pit) Cenote

The guided profile is a spiral. You go down one wall to 30 m, then climb in slow circles around a cylinder of water roughly 10 m across at the top, 35 to 45 minutes from stair to stair. Lights come along, though most of the dive runs in daylight.

The halocline arrives first, somewhere between 12 and 18 m. Fresh water sits on sea water that has pushed inland under the limestone, and the shear between the two smears the view like a heat haze under water. The water clears again below. The salt layer is denser, so buoyancy shifts as you cross, and it is slightly warmer than the fresh water above, which catches people out. Seen from beneath, the same boundary shimmers across the ceiling like a surface.

Around 30 m the dive reaches a floor that is not one. An opaque hydrogen sulphide layer, reported anywhere from 25 to 30 m, stretches the full width of the shaft, with tree branches standing out of the top of it and an island of collapsed rock and timber somewhere underneath. That layer is the turn, not a feature to enter. A diver who went in during November 2025 found it scattered and smeared, so it may not look like the photographs.

Then the ascent, which is the part people remember. Coming back up above the cloud you cross under the overhang to a sloping ceiling near 10 m where the stalactites are, and the light comes at you from an unfamiliar angle: a column of sunlight falling in through the jungle gash, seen from below. Scale, water and light are the dive.

Sistema Sac Actun reaches 119.1 m at this shaft, and the guided dive turns at 30 m.12 One figure is the cave under you and the other is your dive, and both belong together. Quintana Roo's flooded caves mostly run shallower than 20 m, in a web of shallow tunnels beneath the jungle, and only a few places drop past 70 m.3

Everything the dive offers is stacked in one column: a light beam from the top, a halocline at mid-depth, a sulphide cloud at the turn and a shaft that carries on out of sight below. The beam is the one feature tied to the calendar. One operator describes it as a few hours a day in summer, when the high sun lines up with the opening, and it needs a clear sky.

Cave divers found the shaft in the mid 1990s.2 Exploration carried on for years: in 2011 a new 180 m passage named Stairway to Heaven was surveyed on a single dive of 11.5 hours.3 None of that water is part of any guided dive.

The cenote has also given up two dated human skeletons, listed among the ten oldest recovered from the state's submerged caves: El Pit 1 at 10,290 years and El Pit 2 at 9,121.4 Operators say the remains were taken out in 2011 for study, and that what a diver sees today is a scatter of small burnt bone that looks like an old hearth. Remains this old are the reason the archaeological rules here have teeth.

Getting in used to be the hard part. Divers walked about 300 m from the dirt road and lowered gear some 7 m to the water on ropes until the wooden steps went in during the winter of 2012.2 The land belongs to the Ejido Jacinto Pat, which is why the cenote carries Cenote Jacinto Pat as a second name.2

CREER's regional register grades The Pit Level 3, so book a shallower cenote first and this one second or third.5 CREER's ratings page lists the cavern as open as of October 2026.

A registered guide is mandatory. The rule belongs to the landowner and is enforced at the gate with CREER's standard behind it, and only a full cave certification removes it; a cavern card does not. One operator notes that the shaft has no permanent line, so you follow the guide and nothing else. Divers describe these as dives that rest on trust in the guide, and advise choosing the operator on the strength of that guide. Buoyancy forgives more here than in a low decorated passage, because there is no ceiling to hit for most of the dive, and it forgives less on the way up, where an uncontrolled ascent from 30 m in open water is the real risk.

Practical things, in the order you meet them. The stairway down is steep, narrow and often wet, and a cenote worker lowers and raises cylinders on a line because there is no room to carry them down, so bring tip money. Swimming and snorkelling are not allowed in this cenote, so a companion who does not dive has nothing to do here. A 5 mm full suit is the usual rental and not overkill for 40 minutes at 25 C with a slow ascent. Gates open at 08:00 and close at 17:00, and no dive may start after mid-afternoon, a harder stop than it sounds after 6 km of dirt road.

Leave repellent and sunscreen off before the dive, biodegradable ones included: the regional rules treat them like any other.