"Kingdom In Twilight", Siegfried's Ship (2004). From the title sequence of this movie. The camera moves through the murky water arriving at a wrecked ship containing the cursed Nibelung treasure and the skull of the dragon Fafnir that used to own it ...

An insanely long underwater shot that we managed to create in only a couple of days, and brilliantly composited by Ingo Putze.