When THRESHER was lost on 10 April 1963, the writer was the Analysis Officer at the Sound Surveillance System (SOSUS)
Evaluation Center in Norfolk, VA. Acting in that capacity, he analyzed acoustic detections of THRESHER by the FOX
hydrophone array at HMCS Shelburne to determine when and why THRESHER lost nuclear propulsion, when two failed
attempts to blow ballast occurred, and when the THRESHER pressure-hull collapsed at great depth.

The purpose of the THRESHER cover-up was to counter - essentially discount - this acoustic-based assessment by
discrediting it and controlling its dissemination, even as classified information.

During his testimony before the THRESHER Court of Inquiry (COI) on 18 April, the writer was aggressively challenged to two
CDRs who disputed his acoustic-based assessment. This aggressive action was terminated only when VADM Bernard Austin,
the President of the Court, ordered it to cease.

The writer's testimony was later supported before the COI by CAPT Patrick Leahy, then BUSHIPS Code 345. Subsequent to his
testimony, CAPT Leahy was subjected by Navy personnel to 16 hours of coercive demands that he change his sworn
testimony. He capitulated after telling Edwin (Sam) Sevastin, a senior acoustic analyst at the DAVID TAYLOR NAVAL SHIPS
RESEARCH AND DEVELOPMENT CENTER (the Model Basin) who had supported CAPT Leahy's testimony, that: "Were not
getting anywhere so we might as well give them what they want."

Later, CAPT Leahy told Sevastin that "Being involved with THRESHER was the end of my career."

And those are the details of the origin and employment of the THRESHER cover-up.