MGM Home Entertainment released this film as "Killer Force" on DVD in 2013 as part of the 12 Action Adventure Movies 3-Disc set. It's the first release since the VHS era.
Peter Fonda has a perm, and a fake beard.
The mine offices shown in this film were situated in Silverton, Pretoria and were then the offices of the South African National Film Board.
Three cast members appeared in James Bond movies. Telly Savalas was Ernst Stavro Blofeld in Agente 007 - Al servizio segreto di Sua Maestà (1969). Sir Christopher Lee was Francisco Scaramanga in Agente 007 - L'uomo dalla pistola d'oro (1974). Maud Adams appeared in three Bond movies as three different characters: as Andrea Anders in The Man with the Golden Gun (1974), as the title character in Octopussy - Operazione piovra (1983), and appeared uncredited in 007 - Bersaglio mobile (1985).
Both director Val Guest and actor Christopher Lee were staples for Hammer Films, but neither had worked together until this movie, which of course was not a Hammer Film.