Equinox makes a housing that goes to 200 feet.
Manual controls, near neutral buoyancy.
You can put a Lumix 14-140 zoom lens in it which is pretty damn wide, just need good lights to make up for the f4 stop (bit slow )
So over cranking (if you are good at manual focus ) should yield some amazing...
I am currently waiting for delivery of an Equinox Housing for my AF100.
I'll post some stuff on my Facebook when I get it in the water: https://www.facebook.com/petebucknell
Might be a few weeks, as i have to decide on external monitors, and am looking at lights too.