Visitors look at fish swimming in tank during a sleepover event at an aquarium in Nanjing, Jiangsu province on June 24, 2017. The aquarium invited visitors to spend a fun-filled night exploring the mysterious creatures of the sea. (Photo/VCG)
Visitors look at fish swimming in tank during a sleepover event at an aquarium in Nanjing, Jiangsu province on June 24, 2017. The aquarium invited visitors to spend a fun-filled night exploring the mysterious creatures of the sea. (Photo/VCG)