Visitors watch white whales perform synchronized swimming with trainers during a show at Haichang Ocean Park in Shanghai on April 15, 2019. (Photos: IC)

Visitors watch white whales make a heart shape with trainers during a show at Haichang Ocean Park in Shanghai on April 15, 2019.

Visitors watch a virtual undersea world inside the sky cinema at Haichang Ocean Park in Shanghai.

Visitors watch a virtual undersea world inside the sky cinema at Haichang Ocean Park in Shanghai.

Visitors watch a virtual undersea world inside the sky cinema at Haichang Ocean Park in Shanghai.

Visitors take cover from water splashed by a killer whale during a performance at Haichang Ocean Park in Shanghai.

Visitors take cover from water splashed by a killer whale during a performance at Haichang Ocean Park in Shanghai.