The IX-529 is an experimental stealth craft manufactured by Lockheed Martin for the US Navy since 1984. It was under secret development until 1993.

The aim is to understand how a small footprint can be achieved on enemy radars and to examine how stealth technology can be used on ships.

Its length is 50 meters and its width is 21. It has a crew of 4 people and can develop a speed of up to 14 knots.

[Source: en.wikipedia.org]