Vuosaari - Pasila - Kruunuhaka district heating tunnel
1987 - 1988, 1991 - 1994, 1996 - 1997

The work included 30 kilometers of tunnel blasting, about 800 000 cubic meters. Pre-blast surveys were done in thousands of apartments and over 5000 computers were dampened. Vibration control was done with Instantel seismographs, including more than 15 000 seismograph days monitoring.



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