in Russia official version is always fake, so no surprise there...
How does that prove in any way that US torpedo destroyed that sub? What evidence is there to support that conclusion? What would US achieve by that attack?
who knows what really happened? maybe 2 Russian subs were supposed to train by shooting "blank" torpedos at each other, but someone was too drunk and accidentally fired a "live" one? but really, the official version makes perfect sense, it's not like accidents like this are uncommon over there..