4.VA-111 Shkval Supercavitating Torpedo
The Russian VA-111 Shkval offers a breakthrough method for underwater weaponry technology. This technology generates a supercavitation bubble around itself unlike traditional torpedoes, which enables it to swim at hitherto unheard-before rates of up to 200 knots underwater. With current anti-torpedo technologies, this great speed makes counteraction quite challenging. The weapon reduces water resistance to very low levels by means of specialised nose architecture and gas injection systems, therefore preserving the cavitation bubble. Although its range is small when compared to traditional torpedoes, its sheer speed makes it a great threat in close-range contacts.