In the 1920s the German military began using a 3-rotor Enigma, whose security was increased in 1930 by the addition of a plugboard.[37] The Polish Cipher Bureau sought to break it due to the threat that Poland faced from Germany, but its early attempts did not succeed. Near the beginning of 1929, the Polish Cipher Bureau realized that mathematicians may make good codebreakers; the bureau invited math students at Poznań University to take a class on cryptology.[38] After the class, the Bureau recruited some students to work part-time at a Bureau branch set up in Poznań for the students. The branch operated for some time. On 1 September 1932, 27-year-old Polish mathematician Marian Rejewski and two fellow Poznań University mathematics graduates, Henryk Zygalski and Jerzy Różycki, joined the Bureau full-time and moved to Warsaw.[39] Their first task was to reconstruct a four-letter German naval cipher.[40]
naval war arctic circle full crack
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Antarctica is a big mainly frozen place, the wind blows a lot, it snows, it thaws too sometimes, water expands when it freezes, ice that is over water can crack making unusual patterns. Google Maps and the like aren't real-time images, but may get updated without notice showing changes that are actually years apart. There are also things going on in Antarctica that don't get a lot of publicity and sometimes people can't be bothered to find out what they are, but that doesn't make them "secret" any more than it is secret that I just had a ham and cheese roll (doh! - now I've given it away).
But when I think about it, why I am spending any time at all talking about about why two very rough concentric circles in Antarctica aren't an example of a medieval structure found on the other side of the world on the flimsiest of evidence? Maybe it's part of a deeper mystery? No it's just fanciful thought by people who have seen pictures of these two things and drawn a conclusion in the way that if you were a bit unusual, you might think the moon and hamburger were the same thing because they are both circular.
Those dark blue patches inside the rings are water above ice. The whole thing is probably a pond or shallow lake that has frozen over during the winter and now it is spring. Warming temperatures and possibly a fall in water level by draining has caused the surface ice to fall and crack in the pattern of two very rough circles . The cracks have allowed some of the remaining underlying water to flow over the top of the ice.
She would have made a clean getaway, had not an iceberg drifted into and run aground in the only entrance (or exit) of the harbor. Mac surmised that if he hit it hard enough, perhaps the schooner could break through and get out. Bowdoin backed up and then rammed the solid ice at full speed. She stopped dead, but indeed a crack in the ice appeared, and as the vessel pressed against it at full throttle, it gradually opened, and she slipped through.
On August 26, 1946, chief of U.S. naval operations Admiral Chester Nimitz announced that a massive combined military expedition dubbed Operation Highjump would be launched into Antarctica in December during summer in the Southern Hemisphere. The operation involved 13 ships, more than 4,700 personnel and a variety of aircraft, including newly purchased helicopters. The naval contingent, known as Task Force 68, was commanded by Rear Adm. Richard H. Cruzen and Rear Adm. Richard E. Byrd commanded the scientific and research elements, with six Douglas R4D-5L aircraft (Navy C-47As) at his disposal.
She would have made a clean getaway, had not an iceberg drifted into and run aground in the entrance (or exit) of the harbor. Mac surmised that if he hit it hard enough, perhaps the schooner could break through and get out. Bowdoin backed up and then rammed the solid ice at full speed. She stopped dead, but a crack in the ice appeared, and as the vessel pressed against it at full throttle, it gradually opened, and she slipped through. 2ff7e9595c
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