Thanks for checking out my work. When shooting under I'm using a Canon 5d in an Aquatica housing with duel Ikelite strobes.

You can get a housing for your camera. Here is a link to have a look if you're interested.

https://www.backscatter.com/group/Olympus-OM-D-E-M5-MarkII-Underwater-Housing

If you have any other questions and decide to get one let me know.

All the best and happy shooting.