When Eddie and Jai are trapped in the shipping container under water, Jai tells Eddie that he "is not afraid". This line is clearly dubbed, and from the movement of his mouth Jai appears to be saying "wu boo pah" ("I'm not afraid") in Mandarin.
A shipping container would not sink in water when it is full of air. When the container with Eddie & the boy in it hits the water, it immediately sinks like a stone. But it is still full of air, which would make it like a flotation device. And since the door was unlatched before it was pushed in the water, Eddie could have just pushed it open. In fact, the impact should have knocked it open.
Interpol has no investigative branch/field agents. The investigative police of the European Union is called Europol. Interpol solely compiles and distributes intelligence gathered by local and federal EU member state police agencies, much like the US FBI, except the FBI has field agents to also gather information and investigate crimes.