The world’s oceans face a myriad threats: Worldwide, coral reefs are being irreparably damaged. Species of marine life are disappearing at an unprecedented rate. Conservation of the marine ecosystem is at a delicate point, and there is no group better placed for the advocacy of marine protection than the dive industry.

Both fresh and saltwater can be many different colours, depending on other substances in the water. Moreover, the colour may vary with time, both seasonally and over longer periods of time. However, research cannot keep up with these changes, and that is why the general public is now asked to join the colour measurements using the Eye-on-Water App on their smartphones.