McCallum (Ashley-Pitt, Dispersal). A very close match to Peter "Hornblower"
Fanshawe, a Royal Navy Fleet Air Arm pilot who was the real sand dispersal specialist.
The method of sand disposal shown in the film is an exact match for the real events.
Fanshawe was transferred to Belaria shortly before the escape, but Ashley-Pitt
was one of the victims.