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TIL The Brandtaucher, a precursor to the German U-boat built in 1851, sank 60 feet to the bottom of Kiel harbor following equipment failure during a test dive. The three occupants were able to escape afterwards by letting water in, thus increasing the air pressure and allowing the hatch to open.

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XE6LP TIL that in 1368, the town of Monção, Portugal was besieged by the Spanish. When food stocks were nearly gone, the locals were said to have thrown some fresh bread over the walls in a show of false confidence in their dwindling supplies. The disheartened invaders left.
DPZV TIL that Gary Busey once got into a fistfight when asked to perform a scene set in Heaven, because it didn’t match his recollection of the afterlife he experienced during a near-death experience.
gJZA TIL The Titanic Was Found During a Secret Cold War Navy Mission
MxN0 TIL that due to budget cuts, the Hubble telescope will eventually burn up in Earth’s atmosphere instead of being brought back and put on display
j00N TIL Pluto’s largest moon Charon was named after James W. Christy’s wife, Charlene. It was later discovered that Charon was an existing figure in Greek mythology (the ferryman of Hades, later known as Pluto), and thus the name was kept.