The Poseidon is a family of drones rather than a single type, with some Poseidons designed only for destroying coastal cities and thus relying on "stealth" capabilities rather than on high speed, and other ones primarily designed to attack carrier battle groups, where the later ones may use the supercavitation, like the VA-111 Shkval torpedo, to be able to gain extremely high speed in attack mode (more than 200 kmph ).