Scuba Diving Lake Atitlán 2026: $55 Fun Dive, $410 Open Water and the Altitude Rule

Scuba diving in Lake Atitlán costs $55 for one fun dive or $89 for a two-tank dive with ATI Divers, the PADI dive centre at the La Iguana Perdida hostel in Santa Cruz La Laguna. A PADI Open Water course is $410 over three days. Those are the operator’s own published prices, read on its website on 1 October 2026.

What makes this dive different from a reef trip is the water itself: fresh, inside a volcanic caldera, and high enough above sea level that every dive counts as an altitude dive. That changes the paperwork you can earn, the way your computer has to be set, and when you can leave the lake afterwards. This page covers those three things, the prices, and the dive sites ATI names.

What ATI Divers charges

Sources: ATI Divers’ fun dives and courses pages, checked 1 October 2026. Prices are in US dollars as published. The course page says every course includes equipment rental and certification costs.

The refresher is for divers who have been out of the water for a while: ATI says an instructor goes over equipment set-up and function, a theory review and a few exercises at the start of the dive.

Accommodation. ATI’s course page says a dormitory bed at La Iguana Perdida is included for the duration of the Open Water course, and a private room is billed with the dorm price deducted. The shop’s PADI listing goes further and says free accommodation comes with any course. Ask which applies to your course before you book.

Why this counts as altitude diving

PADI’s definition is simple: any dive at an altitude higher than 300 metres (1,000 feet) above sea level is an altitude dive. ATI Divers puts Lake Atitlán at 1,562 m; its hostel, La Iguana Perdida, says the lake is over 1,500 metres above sea level. Every dive here is roughly five times past PADI’s line.

Three practical consequences follow, each from the operator or PADI:

1. The Altitude Diver card is cheap to add here. ATI says that if you do two dives you are eligible for the Altitude Diver certification for $130, the same price its course list gives the Altitude Specialty course. PADI says the course is open to PADI (Junior) Open Water Divers aged at least 10, runs over two dives, and covers altitude dive planning, adjusting your dive computer for altitude (or planning with the RDP table or eRDPML), and handling problems at altitude. PADI also says the first dive may count as an Adventure Dive towards Advanced Open Water, so ask your instructor about the credit.
2. Your computer or tables need the altitude setting. That is the core skill PADI’s course teaches. If you dive with your own computer, check its altitude mode before the first dive.
3. You stay at the lake after your last dive. ATI’s course page says you cannot leave the lake the day of your final dive because of the change in atmospheric pressure associated with the ascent. Book your onward shuttle for the following day at the earliest.

ATI does not say on the pages we read whether the Altitude card is required for a fun dive, so we don’t say it is.

The dive sites ATI names

ATI Divers says it keeps groups small with bottom times averaging around 45 minutes, along the shoreline. The sites it describes:

The fish ATI pictures on its lake page are black crappie, largemouth bass, common carp, bluegill and convict cichlid, plus freshwater crabs. The same page describes the caldera as about 18 km across, lined with roughly 300 m of sediment under about 340 m of water.

What we do not publish: visibility, water temperature and a best season. Neither ATI nor any scientific source we captured gives them, so we leave them out rather than guess.

Before you get in the water

Lake Atitlán’s water quality is monitored by AMSCLAE, the lake authority, which publishes a four-colour cyanobacteria alert. Diving is time in the water like swimming, so read the current level and what each colour means on our can you swim in Lake Atitlán guide before you book, and ask the shop about conditions on the day.

If you want time in the water without tanks, the cliff-jump platform at Cerro Tzankujil in San Marcos is on the same public boat route, past Jaibalito and Tzununá, and Santa Cruz also has kayak and paddleboard rentals for time on the surface.

Booking and getting there

ATI Divers’ website takes enquiries through a contact form that asks for your PADI certification number; its PADI listing gives the phone number +502 5706 4117 and the address La Iguana Perdida, Santa Cruz La Laguna. Santa Cruz is reached by boat: public lancha fares and times from Panajachel and the other villages are in our Lake Atitlán lancha routes guide, and the road leg from Antigua is in Antigua to Lake Atitlán. For how Santa Cruz compares with the other villages as a base, see our Lake Atitlán towns guide; everything else to do in the country is in our activities index.

Where to stay

Divers on an Open Water course get a dorm bed at La Iguana Perdida, per ATI’s course page. Anyone else needs a bed for the night after the last dive anyway, because of ATI’s same-day rule, and a bed in Santa Cruz keeps you in the village where the dive shop is.

Prices, courses, dive sites and the same-day rule were read on ATI Divers’ own website on 1 October 2026 (through a fetch service, because the site blocks automated readers); the address and phone are from its PADI dive-centre listing, and the altitude definition and course prerequisites from PADI’s Altitude Diver page, all checked the same day. Re-check with the shop before you travel.