Jerzy Kowalczuk has been posting a series of amazing images of divers under the ice around Canada on the Wetpixel Facebook group. The above images was taken in Tobermory, Ontario, Canada with a water temperature of 1°C. It was shot using a Nikon D800E in an Aquatica housing, using a Sigma 15mm f2.8 lens. Strobes were Ikelite DS161s.

Settings were f6.3 @ 1/60 - 1/80,ISO400 - 600. Strobes on 1/2 power.