A stuntman on the Bulgarian set of Expendables 2 died Friday while filming an explosion scene. Police said another man was seriously injured, and was rushed to the hospital, where he underwent a five-hour operation. The names and nationalities of the men were not released. The men were performing a stunt that involved an explosion on an inflatable boat on the Ognyanovo Dam, just outside of Sofia, the capital. The film stars Sylvester Stallone, Bruce Willis, and Arnold Schwarzenegger.