Creation of a stabilisation system in water

[clowe8]

Hi, I am trying to create a stabilisation device using a motion sensor to detect the position and motors to correct it. I have so far been looking at inertial measurement units and stepper control phidgets. I was wondering if anyone had any advice at all on which components I would need for this and how I could go about connecting it. Thank you for any help!

[InigoMontoya]

What is the application?

 

I mean, a suitable stabilization device for a diving bell would be radically different than one for a hydroplane.