The suspense that Guest generates - which includes the arrival of a gung ho American soldier who just manages to keep the news to himself, but must endure a whipping for his silence, helps to offset the flagrant and unthinking racism of the film. It is unfair to dismiss the film on these grounds, because the psychotic malevolence of the Japanese creates much of the films enjoyment. They are evil on almost biblical terms and much humour is added by Hammer’s casting decisions. The chief villain Yamamitsu is played by Durham born actor Ronald Radd, his second in command Sakamura is played by Indian born Marne Maitland, but the best is yet to come…look out for Michael Ripper as a jovial Japanese driver! His joy and amusement on having learned that Japan have lost the war is quite perplexing! A series of subplots involving plans to escape seem like padding the film could have done without and Barbara Shelley as the films moral conscious Kate Keiller is badly underused. The film predictably concludes with a protracted (but highly entertaining) battle, and an unfair burden for the enigmatic Lambert. The Camp on Blood Island caused something of a stir on its release, and was memorable enough for Hammer to produce a sequel of sorts called The Secret of Blood Island in 1964. This is a powerful and at times harrowing POW drama marked by a briskness of pace and a surprising lack of sentimentality.