Professor, Just a guess, do you work for Benthos? They were an account of mine many years ago and a friend has a couple of ROVs.
The housing I have is made in Austria by the leading manufacturer of underwater housings in the world, Subal
Subal underwaterhousings for digital cameras - Underwaterphotography with Subal
This is my second housing by them and they are exquisitely designed and built...but VERY pricey. I use it to house a Canon D1-Mark IV with a variety of "L" glass lenses...again, pricey cargo and that's why I opted for the best in housings. I keep trying to raise the bar in terms of the quality of the images I bring to my audience and the next series of "how to" and "where to" videos should demonstrate that commitment.