The Fortress of Panikotha is a magnificent stone structure in the sea, built right at the mouth of the creek. Approximately one nautical mile from the Diu jetty, it also has a light house and a small chaple dedicated to Our Lady of the Sea. Located in the middle of the sea, the fortress creates a beautiful view whether seen from the jetty, from the Fort, from the Village of Ghoghla or from Diu proper. Special light effects at night give it a mesmerizing beauty. To reach Panikotha, tourists boats are available.
Legend has it that this ship shape structure was one connected with land by an under sea tunnel. You can see this monument in famous bollywood movie "Qayamat". The movie was a remake of the English movie "The Rock". The Alcatraz Island in San Francisco in the Rock and the Fortim de Mor in Diu in Qayamat were similar in that both of them are island fortresses which were once prisons.
http://www.filmapia.com/published/movies/q/qayamat-city-under-threat 
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Islands, Movie Locations 
