Coleman,

I have a script by Ockham called Bubbles or something like that, that emits bubbles, which I have used before in underwater animations. I am sure I could get a good effect with that, although, in reality, there will be no bubbles from a submarine, lol, it will sort of defeat the purpose of being a stealthy ship. :-)

In films and movies they often cheat for effect. In most submarine clips, because there is no external markers, you cannot actually see that something is moving, so adding bubbles gives a visual market to make the viewer think the object is moving. If they didn't add the bubbles, the submarine would literally look like it is standing still, unless it was moving past something like rocks or the surface ot the ocean bed.

It is the same with muzzle flashes in movies. Real guns, in daylight, make very little of a muzzle flash and the flash that it does make lasts for hundreths of a second, but in movies you always see massive brusts of flame. if they didn't add this, you would actually not realise that the gun has been fired. If you look at news clips where this effect has not been added in the guns look a lot different when they fire compared to the guns in movies.

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