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" ... Shkval uses supercavitation, meaning that it generates a bubble of gas from the nose and then flies within it. This reduces friction which allows it to travel about three times faster than a regular torpedo. The trade-off is agility, because it cannot turn sharply in case it finds itself outside the gas bubble. So it is regarded as a defensive weapon in a sub against sub duel. Even if the other sub launches first it can win the race and deliver a killer blow. ... "