The Over-Under Split Shot

 One of the most challenging photos that an underwater photographer can capture is the split shot. Some people call this an over under shot where part of the lens is above water and part is below.
 For this effect the wider and bigger your lens the better. I have an 8 inch dome port over my 10mm super wide angle lens. The large lens port can break the surface and give you the desired effect. I have seen this style of photography done with GoPro cameras so don't hesitate to try. Also having your camera on continuous burst mode gives you a better chance of getting the wave and the subjects in perfect harmony.
  As always practice this technique so you will be ready when the perfect moment appears.