If you were producing a movie only for DVD release, you could probably have simply used SH4 to produce all your external scenes...submerged or surfaced (where you don't need closeups of humans). No need for expensive CGI. I say this based upon having watched History Channel's "Dogfight" series in which the CGI is not much better, if at all, than the 2001 vintage IL2/Forgotten Battles Flight Simulation.
Well, maybe PC graphics aren't quite there yet, but in another year or two they might be giving mainstream Hollywood CGI studios a run for the money.
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