When submarines became a frightening threat to the navies during World War 2, military developers were forced to find innovative ways to combat the sneaky vessels. Many weapons were created during and after the war, but when the Soviets came up with the Soviet Smerch-2 Reaktivno-Bombovaja Ustanovka, or RBU-6000, during the Cold War, it immediately became the stuff of nightmares.A 90P missile and RGB-60 depth-charge launcher, the RBU-6000 was among the favorite anti-submarine defenses throughout the 1960s and beyond, and was fitted in countless surface ships. But as powerful as it was, the platform was fundamentally blind.It wouldn’t be until the new century, with the acquisition of precision mechanisms, homing underwater gravitational charges, and hydro-acoustic jamming, that the system would meet its true potential in the upgraded RPK-8.