Cirque du Soleil's "O" is a long-running aquatic resident show at the O Theatre inside the Bellagio Hotel & Casino, inspired by the concept of infinity and the elegance of water. The production features a cast of acrobats, synchronized swimmers, divers, and aerialists — including eight Olympians — performing in, on, and above a custom-built 1.5-million-gallon pool. Audiences can expect water acrobatics, aerial work, fire dancing, surreal water dancing, and high-diving, with 75 artists and 130 technicians bringing each performance to life. The show runs approximately 90 minutes.