Heidenheim event is considered the strongest épée event in the world, stronger even than the World Championships or the Olympic Games. Opera Festival Annually Heidenheim puts on the Opera Festival "Opernfestspiele Heidenheim" in Hellenstein Castle. The festival developed out of the former serenades held there. Over the past years it has received international recognition and critical acclaim under the artistic direction of conductor Marco-Maria Canonica. In the summer of 2009 the Festival will stage Marschner's opera "Der Vampyr", which will be the second part of a cycle of three operas under the motto "Romantik im Rittersaal". The first part was von Weber's "Der Freischütz", performed in 2008, and the third and final installment will be Wagner's "Der fliegende Holländer" in 2010. During the summer of 2010 all three operas will be performed in full cycles. The Opernfestspiele Heidenheim draws visitors from around Europe and overseas, and has significantly boosted the city's reputation as an important cultural site. Residents also enjoy the annual theater festival in the outdoor Nature Theater. Sport Another primary sport club in Heidenheim is Heidenheimer Sportbund (SB), which offers a number of different kinds of sports. Its football division is led by FC Heidenheim 1846, which plays at the Voith-Arena. The team has experienced success in recent years, rising two tiers in the German football league system after winning the Regionalliga Süd in 2009. It now competes in Germany second level, the 2. Bundesliga. Heidenheimer SB's baseball division, Heidenheim Heideköpfe, plays in the first division of the Baseball Bundesliga. The club has made the playoffs in almost every year since it reached the first division in 2001, and won the championship in 2009. Economy and industry Industry In economic terms, Heidenheim's main claim to fame is being the headquarters of Voith, an industrial company specializing in turbines and machinery for the paper-making industry. Voith is Heidenheim's single-largest employer and it employs 7,500 people in and around the town. In May 2006, the world's first Paper Technology Centre was opened in Heidenheim at the cost of 75 million euros. Voith bills the centre as "the most important center for paper research in the world". Transport Heidenheim is a stop along the Brenz Railway that runs from Aalen via Heidenheim to Ulm. The regional train line is also part of Heidenheim's local public transport system. The town has a second train station on this line at the suburb of