The emergency system worked… until it couldn’t. ⚓ During USS Thresher’s 1963 deep-dive test, a likely seawater-pipe failure shut down the reactor. The crew tried to blow high-pressure air into the ballast tanks, but later Navy tests showed moisture could freeze in a restrictive filter and choke the airflow. Investigators never proved that caused the loss. One possible blockage. A system the crew needed to surface. What detail stands out to you? #USSThresher #NavalHistory #SubmarineHistory #MaritimeHistory #Engineering #HistoryTok #HistoryReels #ColdWarHistory - @amazeifystore