Torpedo Warhead Physics
(Intel Source: The Sub Report) This open-source article from "Dr. Karl" purports to explain the physics behind the destructiveness of a modern torpedo warhead:
"First, the actual explosion generates a very high pressure shock wave. This rams into the middle of the underside of hull of the ship at about 1.5 kilometres per second.
"Second, the shock wave crushes the underside of the hull, and also lifts it up. It bends the ship bend upward in the middle, like a banana. The upper decks of the ship crack apart. After a few hundredths of a second, the shock wave has come and gone. But within a few more fractions of a second, the expanding bubble of gas from the explosion then hits the underside of the hull. The bubble reaches a maximum size of about 18 metres across, and it maintains the massive upward force on the bottom of the hull, once the shock wave has passed. So the ship is bent upwards in the middle in two stages - from the shock wave and then the expanding gas.
"Third, after about half-a-second, the bubble (thanks to some fancy physics) begins to shrink. The ship then "sags" in the middle, and begins to "banana" in the other direction. This breaks the hull of the ship even more. Navy people call this sagging the "whipping" phase. It's actually very "useful" in breaking the back of a ship - after all, if you want to break a stick, it's much more effective to bend it back-and-forth, rather than bend it in only one direction.
"Fourth, after about one second, the shrinking bubble has reached its minimum size, and begins to expand again. The water pressure around it is greatest directly underneath (being further from the surface) and least at the top (being closest to the surface). So it tends to expand upwards more than downwards - in fact, it pushes a lot of water upwards as a high-speed wall of water. This "bananas" the ship back in the first direction again.
"Finally, the wall of water and the enormous bubble ram right through the hull. Combined, they can be powerful enough to completely rip the superstructure (that is, everything above the hull) clean off the ship, giving the appearance of a second explosion. The hull is often snapped into two separate halves."
All I know is, torpedos make things blow up!