Maurice 'Mo' Robinson, 26, was part of a million-pound people-smuggling ring
Gang brought people into Britain in back of lorries - earning him £100,000
In October 2019, Robinson opened back of his refrigerated trailer in Grays, Essex
Was met with a gush of steam and the 39 bodies of people who died on journey
Robinson admitted 39 counts of manslaughter and is now facing sentencing
Robinson called Ronan Hughes - the gang's ringleader - when he found bodies
The final moments of the victims were played at the Old Bailey on Thursday