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In the video that was posted by Mozart, the dive brief is showing a depth of 18 meters... is that correct? If so then they're leaving 15 meters of the piling untouched... (do I understand this correctly?)
The pier is not the end all be all of dive sites in Duma. I went there just for Apo Island and enjoyed it. Plus the chicken inasal is soooo delicious...mmmmm....
I can confirm that the max depth at the bottom of the small pier is 18m - it does go deeper but there is nothing worth looking at. The larger pier is slightly shallower but only by a couple of metres.