The worlds best torpedo has just gotten better with the Mod-7 upgrade kits being delivered to the fleet and new MK-48s being built. Why is this heavy torpedo so good? The Mod-7 upgrade will make it very, very smart and once it gets its hooks into you your chances of escape are pretty small. Its also very fast, unofficially at least 63 mph and its range is upwards of over 25 miles. Its very quiet and its on top of the enemy before he can effectively react and the MK-48 is far more maneuverable then a submarine is. We are late to the party with these super cavitating SKVAL type torpedo's for a good reason. While 200 mph is fast its not that fast and once the torpedo starts turning and leaves its cavitation bubble is becomes very unstable and cant keep up with a very quiet USN boat. The sensors on the SKVAL are not only not as good but they are far less effective at those speeds. Basically the super cav fish are only good in a straight line and they are easily detected because they are so noisy. They are also more susceptible to counter measures. But not the MK-48. Also the MK-48 uses the very stable OTTO-ll that is also safer to store then the chemical cocktails driving these Russian super cav fish. I'd say just ask the survivors of the Kursk submarine about that but there aren't any survivors. With a 650lb class warhead designed to blow under the hull of a surface ship, or close to a enemy submarine, and with a max depth of somewhere near 2,600', the MK-48 M-7 can not be fooled or out ran, out dove, or out smarted. It will be replaced by an even deadlier new fish in the decades to come fired out of a SSN(X) already on the drawing boards that will draw heavily on tech already proven in the 3 Seawolf class SSNs. Its a very,very,very,very good torpedo.