The Safest Submarine Ever Built — And the Test That Killed 129 Men

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Sources: https://www.history.navy.mil/research/histories/ship-histories/danfs/t/thresher-ssn-593.html; https://www.newspapers.com

Visual credits: - "NH 97544 USS Thresher.png" by AnonymousUnknown author; Public domain https://creativecommons.org/publicdomain/mark/1.0/; https://commons.wikimedia.org/wiki/File:NH 97544 USS Thresher.png; cropped, color-adjusted, and animated for video. - "Ships searching for USS Thresher (SSN-593), 15 April 1963 (NH 97555).jpg" by PHCS Parker, U.S. Navy; Public domain https://creativecommons.org/publicdomain/mark/1.0/; https://commons.wikimedia.org/wiki/File:Ships searching for USS Thresher (SSN-593), 15 April 1963 (NH 97555).jpg; cropped, color-adjusted, and animated for video. - "MAIN BALLAST TANK (9488526).jpg" by U.S. Navy AUKUS-IA by Cmdr. Erik Wells; Public domain https://creativecommons.org/publicdomain/mark/1.0/; https://commons.wikimedia.org/wiki/File:MAIN BALLAST TANK (9488526).jpg; cropped, color-adjusted, and animated for video. - "A serene underwater scene capturing air bubbles rising to the ocean's surface at night." by Emiliano Arano; Pexels License (free for commercial use) https://www.pexels.com/license/; https://www.pexels.com/photo/going-underwater-at-night-15591206/; cropped, color-adjusted, and animated for video. - "A yellow submarine navigates calm ocean waters against a clear sky near a rocky coastline." by Diego F. Parra; Pexels License (free for commercial use) https://www.pexels.com/license/; https://www.pexels.com/photo/pontoon-near-rocks-on-shore-15565792/; cropped, color-adjusted, and animated for video.

Visual license note: photographs retain their indicated licenses.

Production disclosure: AI-generated narration; research and editorial review use multiple public sources.

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