Sea Shadow (IX-529) was an experimental stealth ship built by Lockheed for the United States Navy to determine how a low radar profile might be achieved and to test high stability hull configurations that have been used in oceanographic ships.
Sea Shadow sailing through Californian waters near San Francisco in March 1999
Sea Shadow bridge
A stealth ship is a ship that employs stealth technology construction techniques in an effort to make it harder to detect by one or more of radar, visual, sonar, and infrared methods.
The Type 45 Royal Navy destroyer. Examples of stealthy ships.
Detail of Forbin, a modern frigate of the French navy. The faceted appearance reduces radar cross-section for stealth.
US Navy Sea Shadow (IX-529) uses both a tumblehome hull and SWATH to reduce its radar return. But fully stealth ship designs are rare.
French frigate Surcouf of the La Fayette class