Grey nurse shark or Carcharias Taurus was turning left close in front of my wide-angle dome lens.
The wide-angle shark picture was taken on the morning dive at Broughton Island dive site, 14 km northeast of Port Stephens, NSW Australia.

The camera I use is Canon 7D Mark II, Nauticam housing NA-7DMKII, Tokina 10-17mm f/3.5-4.5 AT-X 107 AF DX + Kenko Teleplus Pro 300 AF DGX 1.4x, 2x Inon Z-240, RGBlue 02.
F-stop: f/8, Exposure time: 1/125 sec, ISO speed: ISO 200.

The image was post-processed using Adobe Photoshop (Beta) 25.4.0 to remove some floating particles in the water.
Adjusted the brightness, contrast, colour balance, exposure, curve and vibrance.