SUB ZERO RELEASE
  1. the Awareness Levels from the Gradation Chart are assessed from the bottom -34 up. When the PC's awareness level is called the needle will float. This will be most real to the PC and he will probably comment on it. The Examiner stops at that instant, indicates the floating needle. The examiner notifies the Auditor that a Sub Zero Release has been obtained. (HCOB 2 Jan 67)
See also MINUS SCALE RELEASE.

Technical Dictionary