Did you know...

Whale sharks are the biggest fish in the sea! The largest reported individual weighed in at a staggering 21.5 tons and 12.6 meters in length. In a healthy environment, they’re also known to live up to 100 years old.

Did you know?

There are more than 3,000 different species of nudibranchs, many barely visible to the human eye! Some species can even store the venom from their food – like toxic sponges and hydroids – to use as a defense mechanism against predators.

Did you know?

Coral polyps are actually animals that can reproduce in two different ways. Because of its asexual capability, naturally broken fragments can be attached to artificial reefs to nurse the colony back to life, or create an entire new habitat altogether!

Did you know?

Butterfly fish are actually masters of camoflauge! Their markings mask their eyes, and several species have dots on their tails to confuse eager predators.

Did you know?

Ghost nets are one of the greatest physical threats to marine life. Every year, thousands of sharks, whales, dophins, and more are entangled in these abandoned or lost nets. When they drift onto our bays and pinnacles in Koh Tao, our ecoTrust team removes them as soon as possible to mitigate risk to our wildlife and coral.

Get an introduction to our projects conserving the underwater world of Koh Tao

One Day ecoDives

As scuba divers, we have the unique ability to take direct action against the threats to the ocean environment like climate change, pollution, and marine species decline.

Whether you’re a holiday diver, student or professional, learning marine conservation skills can enable your contribution to projects all over the world actively saving our seas, and improve your fun diving experiences forever.

An advanced knowledge of coral, marine species, and the incredible interactions of the underwater ecosystem makes all future diving even more remarkable. 

This one day program starts with an academic session with a conservation instructor, introducing you to our incredible local reef ecology, teaching you the important roles of different species from whale sharks and turtles to coral and reef fish, down to the species we can’t even see. You’ll understand how important healthy balance is to the ecosystem and be introduced to the projects we run to restore and maintain this balance.

Then you’ll go out on 2 ecoDives, practising identifying signs of health and stress on the reef, observing and identifying species, and learning how to replant a coral fragment. 

Space on our ecoDive programs is limited, so please get in touch to enquire about availability. 



  • Academic and in-water training
  • Maximum of 4:1 student to instructor ratio
  • 2 ecoDives with an ecoTrust conservation instructor
  • All equipment
  • Digital materials to continue your education!

Prerequisite: Advanced Open Water Diver or equivalent

Multi-day ecoDiving Packages available

Join a second or third day of ecoDiving, learning new skills and contributing to more projects on our reefs, or upgrade to our five day ecoDiver program!