First stealth ship

The earliest known ship incorporating stealth technology is the US Navy Sea Shadow, which was completed in the mid-1980's but only revealed to the public in 1993. The bizarre-looking twin-hulled ship is 49.98 m (164 ft) long, 20.72 m (68 ft) across and has a full load displacement of 569 tonnes (1.25 million lb). It was built by Lockheed Martin, has a crew of 10 and a top speed of 18.52 km/h (11.5 mph).