![Caisson workers of IJ tunnel received piece of rock crystal from mountain tunnel worker from Austria, March 6, 1967, tunnels, The Netherlands, 20th century press agency photo, news to remember, documentary, historic Caisson workers of IJ tunnel received piece of rock crystal from mountain tunnel worker from Austria, March 6, 1967, tunnels, The Netherlands, 20th century press agency photo, news to remember, documentary, historic](https://c8.alamy.com/comp/2FX9YA1/caisson-workers-of-ij-tunnel-received-piece-of-rock-crystal-from-mountain-tunnel-worker-from-austria-march-6-1967-tunnels-the-netherlands-20th-century-press-agency-photo-news-to-remember-documentary-historic-photography-1945-1990-visual-stories-human-history-of-the-twentieth-century-capturing-moments-in-time-2FX9YA1.jpg)
Caisson workers of IJ tunnel received piece of rock crystal from mountain tunnel worker from Austria, March 6, 1967, tunnels, The Netherlands, 20th century press agency photo, news to remember, documentary, historic
![Amazon.com: HistoricalFindings Photo: Dnieperstrai Dam,Russia,Russian Workers Inside Caisson,Construction : Home & Kitchen Amazon.com: HistoricalFindings Photo: Dnieperstrai Dam,Russia,Russian Workers Inside Caisson,Construction : Home & Kitchen](https://m.media-amazon.com/images/I/61+wdhGxHhL._AC_UF894,1000_QL80_.jpg)
Amazon.com: HistoricalFindings Photo: Dnieperstrai Dam,Russia,Russian Workers Inside Caisson,Construction : Home & Kitchen
Missouri History Museum - Workers used caissons—open-bottomed iron chambers that are kept watertight by pumped-in air—to build the Ead Bridge's underwater piers. As they descended and pressure increased, dozens of workers would
![Inside views of the East River Bridge caisson, Brooklyn, N.Y. / from sketches by our special artist. | Library of Congress Inside views of the East River Bridge caisson, Brooklyn, N.Y. / from sketches by our special artist. | Library of Congress](http://tile.loc.gov/storage-services/service/pnp/cph/3c20000/3c24000/3c24900/3c24944r.jpg)
Inside views of the East River Bridge caisson, Brooklyn, N.Y. / from sketches by our special artist. | Library of Congress
![Development of myopia as a hazard for workers in pneumatic caissons | British Journal of Ophthalmology Development of myopia as a hazard for workers in pneumatic caissons | British Journal of Ophthalmology](https://bjo.bmj.com/content/bjophthalmol/86/11/1274/F1.large.jpg)
Development of myopia as a hazard for workers in pneumatic caissons | British Journal of Ophthalmology
![An old engraving of Triger's pneumatic caisson in the 1800s. It is from a Victorian mechanical engineering book of the 1880s. A caisson is a watertight structure for excavating the foundations of An old engraving of Triger's pneumatic caisson in the 1800s. It is from a Victorian mechanical engineering book of the 1880s. A caisson is a watertight structure for excavating the foundations of](https://c8.alamy.com/comp/2D8M6PX/an-old-engraving-of-trigers-pneumatic-caisson-in-the-1800s-it-is-from-a-victorian-mechanical-engineering-book-of-the-1880s-a-caisson-is-a-watertight-structure-for-excavating-the-foundations-of-piers-and-bridges-they-are-pressurised-boxes-filled-with-compressed-air-to-keep-water-and-mud-out-an-airlock-allows-access-to-the-chamber-workers-sandhogs-remove-mud-and-rock-debris-muck-from-the-workspace-to-the-surface-here-by-buckets-when-the-caisson-hits-bedrock-the-area-is-filled-with-concrete-forming-a-solid-foundation-2D8M6PX.jpg)
An old engraving of Triger's pneumatic caisson in the 1800s. It is from a Victorian mechanical engineering book of the 1880s. A caisson is a watertight structure for excavating the foundations of
![Discovering NYC on X: "Sandhogs working in the caisson of the Brooklyn Bridge, 1870. 27 workers died during construction #NYC #history https://t.co/ZSysxSB9uW" / X Discovering NYC on X: "Sandhogs working in the caisson of the Brooklyn Bridge, 1870. 27 workers died during construction #NYC #history https://t.co/ZSysxSB9uW" / X](https://pbs.twimg.com/media/CS8rbTzXAAA3PDG.jpg)