Tourists enjoy delicacies in the undersea tunnel. (CNS/Tong Yu)

Tianjin Haichang Polar Ocean World witnessed the happy scene of tourists enjoying delicacies in undersea tunnel on the evening of Sept. 1, 2014. Several rock musicians played musical instruments together to celebrate the upcoming Mid-Autumn Festival, a traditional Chinese holiday. And people indulged themselves in the unique underwater concert and delicious foods.