Central London is destroyed in a nuclear terrorist attack, survivors (including convicts from a high security prison) are contaminated with radiation and turn into bloodthirsty mutants. One disparate group of survivors made it to a Secret Nuclear Underground Bunker (S.N.U.B.) just in time. Their sanctuary soon becomes their tomb however, when the convicts find a way inside and begin to pick them off... one by one. Grisly low-budget British horror S.N.U.B. was directed by Jonathan Glendening.