Дайв-сайты: Guatemala

Lake Atitlan sits at approximately fifteen hundred and sixty metres above sea level, requiring significant adjustments to standard dive tables and computer algorithms. The reduced atmospheric pressure at altitude means that nitrogen loading occurs differently than at sea level, and standard no-decompression limits must be modified. Most dive computers have altitude mode settings that should be activated before diving. Conservative dive profiles are essential, with reduced bottom times and extended safety stops. Divers should arrive at altitude at least twelve hours before diving to allow some acclimatisation. Flying after diving requires additional surface intervals beyond the standard recommendations. All dive centres at Lake Atitlan are experienced with altitude diving procedures and will brief divers thoroughly on the adjustments required.

Several pre-Columbian structures lie submerged along the lake's shores, believed to have been inundated by a rise in the lake level approximately two thousand years ago. The most accessible structures are found near the town of Samabaj, where stone walls, ceremonial platforms, and what appear to be altar structures are visible on the lake floor between twelve and twenty metres depth. The site was identified by recreational divers in 1996 and has since been the subject of archaeological investigation. Divers can observe the structures on guided dives, but touching or disturbing the archaeological remains is strictly prohibited. The structures are most visible during the dry season when lake levels are lower and visibility improves.

Lake Atitlan diving is safe when conducted with experienced local operators who understand the lake's unique conditions. The primary considerations are altitude diving adjustments, variable visibility that can change rapidly, and cold thermoclines below twenty metres. The lake floor drops steeply from the shoreline, reaching depths exceeding three hundred metres in the centre, making depth awareness critical. Hydrogen sulfide layers exist at greater depths and should be avoided. Two established dive centres operate on the lake, both staffed by experienced instructors who know the conditions intimately. Independent diving without local knowledge is not recommended due to the lake's complex bathymetry and altitude considerations.