Why the USS Thresher (SSN 593) Was Lost (Hardcover)

Why the USS Thresher (SSN 593) Was Lost By Bruce Rule Cover Image

Why the USS Thresher (SSN 593) Was Lost (Hardcover)


Not On Our Shelves—Ships in 1-5 Days
(This book cannot be returned.)

The US nuclear submarine THRESHER (SSN-593) was lost because standard compensation procedures to adjust for hull compression during the deep-dive on 10 April 1963 were not followed. Consequently, THRESHER was heavy (negatively buoyant) at test-depth (1300 feet) and unable to deballast because adiabatic cooling froze moisture in the air-lines to the ballast tanks, blocking those lines.

Operation of the Reactor (Main) Coolant Pumps in FAST (2-pole mode) may have contributed to a reactor scram (shut-down) and loss of propulsion at 0909.0R (local time). THRESHER sank at an average rate of 120ft/min from test-depth (1300-feet) at 0909.0R to collapse at 09:18:24R at a depth of 2400-feet (1070 psi) in 1/20th of a second, too fast to be cognitively recognized by those aboard who - although they knew collapse was imminent - never knew it was occurring.

The Navy Court of Inquiry (COl) dismissed the results of their own test which established conclusively that flooding at test-depth - the COI's assessed cause of the disaster - would have been a catastrophic
event and would not have been reported by THRESHER to her escort ship, the USS SKYLARK (ASR 20), at 0913R as "experiencing minor difficulties." Multiple lines of evidence - discussed in detail by Chapter
1 of this assessment - confirm there was no flooding prior to collapse of the pressure-hull at great depth.

Product Details ISBN: 9781608881680
ISBN-10: 1608881687
Publisher: Nimble Books
Publication Date: December 31st, 2017
Pages: 62
Language: English