An airship is a power-driven aircraft which is lighter-than-air aircraft and navigated using the air under its own power engine. The first successfully navigated airship was invented in 1884 in France. Key raw materials used in the manufacturing of airships include, Dacron, Polyester, Mylar, and Tedlar bonded with Hytrel. The envelope of an airship form a single gas bag and helium is most commonly used gas inside envelops. Airships are extensively used for surveillance & reconnaissance, intelligence, communication, border patrolling, law enforcement, weather forecasting, and coast guarding.