Approved | | Drama, Fantasy, Horror
An American tourist, a youth gang leader, and his troubled sister find themselves trapped in a top secret government facility experimenting on children.
The helicopters seen are Westland Whirlwinds.
If I could explain these I wouldn't have to make them.
A shadow of a crew member can be seen moving after King shoots the soldier in the lab.
Over the end credits a Government helicopter continues to pursue the speedboat with Simon and Joan on board taking evasive action, before an inconclusive fade.
Cut prior to 1961 X rated cinema release over child concerns. It was further cut for US theatrical release. The cuts were restored in 2010 for UK 12 rated DVD and 2019 Blu-ray release.