When I visited, I went out with a guide named Moises at ScubaTony. He was a marine biology student at the time. He showed us how the south sides of the coral formations were being smothered with a specific red alga. He explained that it was linked to nutrient pollution from cruise liner sewage. He explained how the 4th terminal, south and up-current of all the others, could bring a devastating new point source.
It was really sad to see the videos of those pylons going in amid the protests of the local community.