Sewer chamber underneath Cologne, Germany, constructed in 1890 for a planned visit by the Kaiser to see the grand infrastructure project. The chamber had a chandelier, which has been restored since for occasional visits by officials or tour groups, and a plaque commemorating the sewer system. (The Kaiser, in the end, did not make the visit.)  Cologne, Germany; photo by Steve Duncan / www.undercity.org / steve@undercity.org.
 Sewer chamber underneath Cologne, Germany, constructed in 1890 for a planned visit by the Kaiser to see the grand infrastructure project. The chamber had a chandelier, which has been restored since for occasional visits by officials or tour groups, and a plaque commemorating the sewer system. (The Kaiser, in the end, did not make the visit.)  Cologne, Germany; photo by Steve Duncan / www.undercity.org / steve@undercity.org.
 Sewer chamber underneath Cologne, Germany, constructed in 1890 for a planned visit by the Kaiser to see the grand infrastructure project. The chamber had a chandelier, which has been restored since for occasional visits by officials or tour groups, and a plaque commemorating the sewer system. (The Kaiser, in the end, did not make the visit.)  Cologne, Germany; photo by Steve Duncan / www.undercity.org / steve@undercity.org.
 Sewer chamber underneath Cologne, Germany, constructed in 1890 for a planned visit by the Kaiser to see the grand infrastructure project. The chamber had a chandelier, which has been restored since for occasional visits by officials or tour groups, and a plaque commemorating the sewer system. (The Kaiser, in the end, did not make the visit.)  Cologne, Germany; photo by Steve Duncan / www.undercity.org / steve@undercity.org.
 A sewage slide with steps in the center, heading toward the overflow tunnel from the main sewage chamber shown above. This is the overflow route when the sewage is high enough to overflow the small sewage tunnel shown in the left of the pics above. That tunnel goes to a treatment plant eventually; but this leads straight to the river. (Overflow happens in combined systems when it rains.)
 Sewer chamber underneath Cologne, Germany, constructed in 1890 for a planned visit by the Kaiser to see the grand infrastructure project. The chamber had a chandelier, which has been restored since for occasional visits by officials or tour groups, and a plaque commemorating the sewer system. (The Kaiser, in the end, did not make the visit.)  Cologne, Germany; photo by Steve Duncan / www.undercity.org / steve@undercity.org.
 On the surface, above the outlet of the sewer tunnel (these days sanitary sewage -- i.e. dry weather flow -- is diverted to a treatment plant, so this original outlet tunnel is only for overflow during rain).
 Above the sewer chamber, an urban park
 Above the sewer, an urban park
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