A detail from one of the test scuba dives at USAT Liberty Wreck (Tulamben, Bali, Indonesia). This big old turtle didn't seem bothered by my presence, so I stayed, for a while, observing and shooting. Again, using my cheap cellphone (Xiaomi Note 7) inside a Divevolk Sea Touch Pro 3 underwater housing, with the Wide Angle converter and red filter. All settings (Aperture, speed, white Balance and ISO) were manually selected and the housing touchscreen performed very well at 18 metres deep.
It was coupled with 2 DivePro Vision Pro+ UW lights (15.000) lumen each, and blue filters.