The loss of the USS Thresher submarine

Louis

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On the morning of April 10, 1963, at approximately 9:18 a.m., USS Thresher was lost with all 129 crew and civilian riders on board. Thresher had just completed a nine-month overhaul and modernization availability at Portsmouth Naval Shipyard in which she received new electronic and sonar equipment as well as other upgrades and repairs.



Conducting several successful shallow dives along the way, Thresher transited east-southeast to her dive point 220 miles off of Cape Cod where the Continental Shelf ends and the ocean’s depth plummets to 8400 feet. As her controlled dive began in 100-foot increments, Thresher sent routine messages to the rescue ship, USS Skylark. At 9:17 a.m., Skylark received a garbled message “…minor difficulties, have positive up-angle, attempting to blow.” Then Thresher went silent. Skylark attempted to regain contact by all means available, but to no avail. Thresher was lost.




From: fosters.com & scottbrowngraphics.com
 

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It's a dangerous business and unforgiving of errors, either human errors or design errors. About the only less forgiving environment is in space.
 
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