This is neither Sipadan, nor Maratua, but still, it is quite impressive to see such a number of barracudas on a shore scuba dive in Tulamben (Bali, Indonesia). They were swimming along with the Batfish like 6 months before. I was using my cheap cellphone (Xiaomi Note 7) inside a Divevolk Sea Touch Pro 3 underwater housing. All settings (Aperture, speed, white Balance and ISO) were manually selected.
It was coupled with 2 DivePro Vision Pro+ UW lights (15.000) lumen each, and blue filters.