Dear Tapio,
"The church hall was excavated using a
certain system: first a large pit was made
while leaving a layer of one or two meters
un-excavated. The last few meters were then
excavated very carefully while planning at the
same tie how to accomplish an acoustically
suitable surface as well as some angles and
rough spots for the sake of outer
appearance."(Timo Suomalainen)
Regards,
R
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