The US Navy's Ghost WarShip

Built by Juliet Marine Systems, a private company in Portsmouth, N.H., it’s designed to fight swarm attacks, water-born IEDs, and, aargghh, piracy. According to Business Insider, “Ghost is intended to have zero radar signature, and the vessel is supposedly difficult for the enemy to spot, let alone target. The ship is nonmagnetic and hard to detect via sonar, making it ideal for infiltration and surveillance of enemy areas.”