O by Cirque du Soleil (Bellagio)

O is a water-based Cirque du Soleil production staged in a custom aquatic theater at the Bellagio that opened with the resort in 1998. The performance is built around a 1.5 million–gallon pool that serves as the central stage, with performers using synchronized swimming, diving and aerial apparatus. The production is a permanent resident show that uses specialized stage engineering, hydraulics and lighting systems unique to the theater.