Micah Jemimah Calahat

Only a small portion of the deep blue has ever been explored; most of it remains a mystery. However, in the far depths of east Luzon, three days from the nearest shore, lies a secret — a protected reef safeguarding stories of survival. 


Researchers from the University of the Philippines Marine Science Institute reveal rich biodiversity and reefscape preserved by Benham Bank, found 50 meters below the sea surface.

The study titled ‘Benthic structuring of the mesophotic coral ecosystem on the Benham Bank seamount in the Philippines’  found the ecosystem to be untouched, preserved and full of potential wherein marine life continues to thrive. 

Secret to science

Benham Bank is an underwater seamount considered to be taller than Mount Apo and contains one of the richest deep coral life in the Philippines. 

Despite the eastern coast of the country belonging to those heavily affected by typhoons, research has proven this sanctuary a home for coral reefs and species. 

“Seamounts enhance ocean productivity and are considered biodiversity hotspots,” shared researcher Joey Cabasan in their study. 

Additionally, seamounts are discovered to have unique seafloor structures which is crucial for corals to thrive as it allows for increase in water circulation, bringing in more oxygen and nutrients and removes waste.

The researchers proved this by discovering many coral species including 11 scleractinian or hard coral genera of varying morphotypes, 10 octocoral (or soft coral) genera, 4 genera of macroalgae or seaweed, and some arborescent sponges.

A Baited Remote Underwater Video Systems was used to capture footage at depths of 61.3 meters during an expedition in 2019.

Stories of survival

“Benham Bank is in a way resilient to physical and thermal stress,” Cabasan added.

Stratification, or the layering of water with various properties have shielded Benham Bank from stress since the upper 40 meters functions like a barrier, stopping the layers from mixing and protecting the lower parts.

Moreover, the area allows for corals and algae to thrive since the water is very clear - light is able to pass through greater depths. 

A survey in 2014 found that Benham Bank shelters more than 60 reef-associated fish species, many of which are commercially important food fish.

The research’s findings also showed how beneficial it is for Filipinos as it is designated as a protected food supply exclusive zone in May 2017. 

The bank serves a’s a glimpse into what lies beyond the surface, and a call to protect what little we’ve uncovered before it’s lost to the unknown.

In a world where most of the ocean remains a mystery, Benham Bank reminds us of the wonders still waiting in the deep—untouched, resilient, and full of life.