I have been wanting to try the Q7 camera underwater, and I managed to find an Ikelite housing that was large enough to fit the Q7 inside.
I had to make a few modifications to both the housing and the camera, but overall this works out quite well.
The camera takes nice photographs underwater, and it is responsive enough in my opinion.
The 3D printed parts can be found via Tinkercad: https://www.tinkercad.com/things/kuWq...
Link to Ikelite Housing: http://www.ikelite.com/housings/sony/...