I have been involved recently in the 3d rendition of volcanic ash clouds, in the dispertion of spillages underwater. I have also been involved in some modelling of other areas not open for discussion.
Routing underwater is heavily reliant on 3d modelling too.
Currently trying to write an application to model houses in relation to their surroundings using 3d
Many, many areas you can utlise 3d modelling and wares.