Which line should I take from Changlong subway station to Shenzhen Bay subway?

Subway line 9. Take subway line 9 from Changlong subway station to Shenzhen Bay subway. Shenzhen Bay is a bay between China, Hongkong and Shenzhen. Its exact location lies between China, Hongkong, Northwest New Territories and the eastern part of Nanshan District, Shenzhen, China. It is located in the west of Yuen Long Plain and the east of Shekou.