The above
cover has been sent "FROM THE OCEAN FLOOR" as depicted in the cover's
cachet. It was sent from the Helgoland underwater laboratory (UWL), which is an
underwater habitat. It was built in Lübeck, Germany in 1968, and was the first
of its kind in the world built for use in colder waters. It was a part of
the National Oceanic and Atmospheric Administration (NOAA) Habitat
project.
The 14 meter long, 7 meter wide and 7 meter high UWL meant that divers were able to spend several weeks under water using saturation diving techniques. The scientists and technicians would live and work in the laboratory, returning to it after every diving session. Only once they had reached the end of their stay did they decompress in the UWL itself, being able to then resurface without coming to any harm.
The UWL was used in the waters of the North and Baltic Seas and, in 1975, on Jeffreys Ledge, in the Gulf of Maine along the coast of New England in the USA.. At the end of the 1970s it was decommissioned. In the summer of 1998 the German Oceanographic Museum was given the UWL by the GKSS Research Centre, Geesthacht. Nowadays it can be visited at the Nautineum, an outpost of the museum in Stralsund.
The 14 meter long, 7 meter wide and 7 meter high UWL meant that divers were able to spend several weeks under water using saturation diving techniques. The scientists and technicians would live and work in the laboratory, returning to it after every diving session. Only once they had reached the end of their stay did they decompress in the UWL itself, being able to then resurface without coming to any harm.
The UWL was used in the waters of the North and Baltic Seas and, in 1975, on Jeffreys Ledge, in the Gulf of Maine along the coast of New England in the USA.. At the end of the 1970s it was decommissioned. In the summer of 1998 the German Oceanographic Museum was given the UWL by the GKSS Research Centre, Geesthacht. Nowadays it can be visited at the Nautineum, an outpost of the museum in Stralsund.
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