A BBC investigation reveals the operations of a violent smuggling gang transporting migrants across the English Channel. Undercover reporters gained access to the gang's hideout in northern France and documented their activities, including cash collection at UK railway stations. Key figures identified include Jabal, Aram, al-Millah, and Abdullah, who lead the gang and engage in violent practices against migrants. The investigation highlights the gang's adaptability and the challenges faced by authorities in combating their operations.