Sea Turtle in its natural habitat — diving encounters and best destinations

Cheloniidae family

Sea Turtle

0.6-1.5 metres
50 to 100 years, with some individuals likely exceeding a century
Critically Endangered (Hawksbill), Endangered (Green)

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The Sea Turtle at a glance

The majestic sea turtle is undoubtedly one of the most universally beloved and sought-after marine encounters for scuba divers traversing the world's oceans. Belonging to the ancient superfamily Chelonioidea, these remarkable marine reptiles have graced our oceans for well over 100 million years, sharing the prehistoric seas with the dinosaurs before surviving the great extinction events that shaped modern biodiversity. Today, seven distinct species navigate the globe, with scuba divers most frequently crossing paths with five of them: the green, hawksbill, loggerhead, olive ridley, and occasionally the colossal leatherback turtle. Adapted beautifully to an aquatic existence, sea turtles feature streamlined, hydrodynamic shells and large, paddle-like flippers that allow them to glide effortlessly through the water, transforming them from clumsy terrestrial wanderers into the elegant aviators of the underwater realm.

Behaviour & reproduction

Size
0.6-1.5 metres (shell length)
Weight
40 kg to 700 kg (Leatherbacks being the heaviest)
Lifespan
50 to 100 years, with some individuals likely exceeding a century
Status
Critically Endangered (Hawksbill), Endangered (Green)

Slightly less common on standard tropical reef dives, but equally magnificent, is the loggerhead turtle. Named for its exceptionally large head and massively powerful jaw muscles, the loggerhead is built for crushing heavily armoured prey. Their diet consists largely of benthic invertebrates, including thick-shelled conchs, bivalves, and formidable crabs, making them vital regulators of the ocean floor community. Meanwhile, the olive ridley turtle, while mostly renowned for its spectacular synchronised mass nesting events known as 'arribadas', spends the vast majority of its life foraging in the pelagic zone. The undisputed giant of this ancient lineage is the leatherback turtle. Unlike its hard-shelled relatives, the leatherback possesses a flexible, rubbery carapace composed of tough, oil-saturated connective tissue. This extraordinary adaptation allows the leatherback to withstand the immense hydrostatic pressures of extreme depths as it dives thousands of metres into the freezing abyss in pursuit of its exclusive diet of jellyfish.

Diving Tips

When approaching a sea turtle, it is imperative to move slowly and remain within their line of sight. Never swim directly over a turtle or block its path to the surface, as they are air-breathing reptiles and panic if they feel trapped when they need to ascend for oxygen. Let the turtle dictate the interaction; if it swims away, do not chase it, as this causes unnecessary stress and rapid oxygen depletion.

Never touch, ride, or grab a sea turtle. Not only is this illegal in most jurisdictions and highly unethical, but human contact can transmit bacteria and compromise the protective mucous layer on their skin and shell. If you are fortunate enough to encounter a turtle resting under a ledge or at a cleaning station, maintain a respectful distance, manage your buoyancy carefully to avoid crashing into the surrounding reef, and enjoy the magical experience of observing them in their natural state.

Fun facts about the Sea Turtle

  • A sea turtle’s shell is actually part of its skeleton, comprising over 50 bones including its rib cage and spine.
  • Female sea turtles return to the exact same beach where they hatched to lay their own eggs, navigating via the Earth’s magnetic field.
  • The sex of sea turtle hatchlings is determined by the temperature of the sand during incubation; warmer sand produces females.
  • Leatherback turtles can dive to depths exceeding 1,000 metres and can regulate their body temperature in freezing waters.
  • Sea turtles lack teeth; instead, they have sharp, beak-like jaws perfectly adapted to their specific dietary needs.

Best time to see the Sea Turtle

Diving with sea turtles is a year-round privilege, but specific locations offer exceptional seasonal aggregations. In the Indo-Pacific, the waters surrounding Sipadan in Malaysia provide virtually guaranteed encounters with both green and hawksbill turtles on almost every dive, particularly when they gather to mate or visit the bustling cleaning stations. Similarly, the Great Barrier Reef in Australia boasts incredible turtle interactions, with nesting seasons generally occurring between November and March, drawing large numbers of females to the shallow coastal waters and remote sand cays.

For those venturing to the Eastern Pacific, the volcanic archipelago of the Galapagos Islands serves as a vital foraging ground for the Pacific green turtle. Here, divers can observe them grazing lazily alongside marine iguanas. In the Caribbean, Playa del Carmen and the broader Riviera Maya region of Mexico offer spectacular drift dives over vibrant reefs where loggerheads and green turtles are a staple sight. While pelagic giants like the leatherback are rarely encountered on standard recreational dives, regions experiencing significant jellyfish blooms occasionally grant lucky divers a fleeting glimpse of these ocean wanderers.

Where the Sea Turtle lives

Found in all oceans except the polar regions, inhabiting coastal coral reefs, seagrass meadows, rocky shores, and the open pelagic zone.

What the Sea Turtle eats

Varies by species: green turtles are herbivorous (seagrass/algae); hawksbills eat sponges; loggerheads eat hard-shelled invertebrates; leatherbacks eat jellyfish.

Sea Turtle: frequently asked questions

When is the best time to see Sea Turtle?
Diving with sea turtles is a year-round privilege, but specific locations offer exceptional seasonal aggregations. In the Indo-Pacific, the waters surrounding Sipadan in Malaysia provide virtually guaranteed encounters with both green and hawksbill turtles on almost every dive, particularly when they gather to mate
How big does Sea Turtle get?
Sea Turtle: 0.6-1.5 metres (shell length)
Is Sea Turtle dangerous for divers?
When approaching a sea turtle, it is imperative to move slowly and remain within their line of sight. Never swim directly over a turtle or block its path to the surface, as they are air-breathing reptiles and panic if they feel trapped when they need to ascend for oxygen. Let the turtle dictate the interaction; if it s
What is the conservation status of Sea Turtle?
Sea Turtle: Critically Endangered (Hawksbill), Endangered (Green)
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