Background Throughout history, the strait that separates mainland Greece from Epirus in the Ambracian Gulf was crossed only by ferry boat with frequent problems due to rough seas, lack of night routes and long waiting hours during summer. In the mid-1990s, Greece sought to remedy this problem by constructing an immersed tunnel between Preveza and Aktio -- one of the nation’s most expensive public works. The tunnel was completed in 2002. Challenge One aspect of the Preveza-Aktio immersed tunnel project was to provide a seismic tunnel monitoring system, where the tunnel equipment monitored the seismic effects of earth activity alongside the dynamic loads of natural transportation movements whether planned or by any unforeseen event. The scope included expansion or contraction sur

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