TSA Survey 2015: Stressfully high water temperatures persisted into October of this year, which was rated as the worst coral bleaching period on record. The sandflats near the fringing reefs several miles offshore, even at moderate depth, became overrun with toxic algae blooms that discolored the normally light calcareous sand.
This Blacktip* research drone photo shows the beneficial impact of the Terra Sub Aqua site beneath the boat on the left. The intense herbivore grazing we can observe while diving controlled the algae infestation. The sand cleaning helps reduce solar heating in the environment. Similar effects are visible near the submerged inshore coral reef to the right.