A free, independent field guide to the reefs and wrecks off Cancun, Isla Mujeres and Puerto Morelos.

Bahía de Mujeres · wreck

The Ultrafreeze Wreck

The Ultrafreeze wreck, known locally as El Frío, is a refrigerated cargo ship of about 60 m, now broken into sections, lying at roughly 25–33 m south of Isla Mujeres. It's the biggest wreck in the bay and a dive for experienced divers.

Illustration of a broken, sponge-covered freighter on sand with a diver for scale, like the Ultrafreeze wreck

Most of the diving around Cancun is shallow reef. The Ultrafreeze wreck is the exception on the Isla Mujeres side: a big steel freighter in deep, open water, usually done as the first dive of a two-tank trip. Operators place it in deep water south of Isla Mujeres, though published distances vary from about 5 to 11 km, and describe a hull now broken into separate sections.

The ship and its history

The Ultrafreeze was a refrigerated cargo ship, or reefer, about 60 m (200 ft) long. Published histories of the ship don't agree. One wreck database says she was launched in 1959 at a shipyard in Hamburg, Germany, as a refrigerated freighter. A Mexican travel article says she suffered a serious fire in the 1970s, and other dive sites describe her as sunk deliberately in the bay as an artificial reef. We haven't found a reliable record of when or exactly how she came to rest here, so treat any date you hear on the boat as part of the story, not a fact.

What is there now is clearer: a local operator says a hurricane split the ship, and divers describe twisted, separated hull sections on sand, with the deepest parts at roughly 30 to 33 m or more and shallower structure above.

The dive

Because of the depth and the open-water location, operators descend on a line or do a negative entry so the group lands on the wreck together. A typical route follows one or two of the main sections and the debris between them, with time limited by depth. The structure is covered in sponges, hard and soft corals and hydroids, and the wreck acts as a fish magnet in otherwise open sand. Expect schools of jacks and snappers over the deck, groupers and barracuda, moray eels in the openings, and the chance of eagle rays and turtles on the sand around it.

Penetration, going inside the hull, needs wreck training, a guide who offers it and the right equipment. Many operators keep groups outside. Old steel wrecks have sharp edges, loose fittings and silt.

A spotted eagle ray swimming over open sand, a possible sighting around the Ultrafreeze wreck
Eagle rays and turtles sometimes cross the sand around the wreck.

Why it's called "El Frío"

Locals call the wreck El Frío, "the cold one". The usual explanation is the water: at the wreck's depth divers often meet a thermocline, a layer of noticeably colder water, after the warm shallows. It is also a pun on the ship's job as a refrigerated freighter. Bring a full-length wetsuit if you feel the cold. A 3 mm shorty that is fine on the reefs can feel thin at 28 m.

Who should dive the Ultrafreeze

Experienced divers. At around 25 to 33 m the Ultrafreeze is beyond the 18 m limit of an Open Water certification, so operators ask for Advanced Open Water or equivalent, and most want recent deep experience. You should be comfortable with:

  • Descents in blue water with no bottom in sight at first.
  • Current, which can be strong here, and drifting off the wreck at the end.
  • Monitoring no-decompression limits and gas closely. Bottom time at this depth is short.
  • A safety stop in open water, often with a surface marker buoy.

If you are newly certified, the Advanced Open Water course is a sensible way to work up to it, with an instructor. Our guide to Cancun drift diving covers the open-water ascent skills.

Planning

Like the other outer sites, the Ultrafreeze depends on the weather. North winds in winter can make the bay rough and cancel trips, and visibility can drop after storms. It is usually followed by a shallow reef, often Manchones, to keep the day's nitrogen low. Check the operator's minimum certification, ask whether they provide nitrox and what group size they take, and plan your flight home around DAN's guidance: at least 12 hours after a single no-decompression dive, at least 18 hours after several dives in a day or several days of diving, and substantially longer after any dive that needed decompression stops.

The two Mexican Navy wrecks off Punta Cancun, the C-58 and C-55, are the area's other deep wrecks, run from Cancun as separate trips. For a different wreck further south, see the C-56 on our Puerto Morelos dive sites page.

The history of the Ultrafreeze is uncertain and published depths and distances vary. The photo above is an illustration, not the wreck itself.