I hate to confirm what BmB said about zooming, but it is correct that when you zoom in on a 3D image, the "closer" elements do not move spatially against the "further away" elements. The reason is simple-- your position behind the camera has not changed.

However, if you are physically moving towards the 3D image, the spatial elements do indeed change, because there is no actual zoom taking place.

That said, I totally disagree with BnB's attitude and position. That "giant fin" clip looks dynamic and interesting, and I think that such a change would be a welcome addition. Let's just not call it a "zoom" but simply a "moving camera shot."

Also, BmB's position about "fog" increasing as the distance down the shaft increases is equally incorrect. Ady is right. That is nothing more than light bleed, which is quite simply, a natural limitation to human vision. The further away something is, the more difficult it becomes to pick out fine details. They tend to "bleed" together, with the more obvious elements (like bright light) obscuring many of the finer details.