https://www.livescience.com/62350-sunken-nazi-submarine-found-denmark.htmlNote the final sentence: “Many of the original 118 Type XXI submarines were captured and dismantled after the end of the war, butcountless others still remain missing.” . This vast, secret undertaking (comparable...
Before World War II, ornithologists had a tough time making sense of bird calls. Unlike, say, a piano, a bird's voice is hard to notate in a meaningful way. But after WWII-era technology used to track submarines - such as sound spectrography - was declassified, the birdsong ga...