From 2013 and up to early 2017, Neotek supplied hundreds of geotechnical instruments for the 6 new stations and TBM tunnel interstations of the Athens Metro extension line to Piraeus. A variety of sensors, including VW strain gauges, crackmeters, tilt meters, load cells, multipoint borehole extensometers, portable inclinometers and casing, in-place inclinometers and automatic telemetry data loggers, are employed to monitor crucial parameters for the TBM passage and constructions in general.