The Aussy officer was only partially correct.
What the torpedo does is....
When the warhead detonates, it creates the first pressure wave. You see this in the first video as the puff of smoke out of the stack...
Now the expanding pressure wave leaves a vacuum bubble. Once the pressure wave expands to a point where sea pressure overcomes the pressure of the bubble, the water attempts to fill the vacuum, violently. When this happens (this is hard to explain) the in-rushing water that is coming in from all sides since the vacuum bubble is a sphere, has so much energy, it sort of passes through itself (this is what is hard to visualize), releasing more energy.... This second pressure wave is amplified and produces the more energetic second explosion you see, breaking the keel.
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