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The BHC digital hydrophone string is designed for efficient recording P-waves in boreholes down to 1000 m for seismic tomographic surveys. High-resolution P-wave tomographic investigations between boreholes are routinely applied for the exploration of development sites considered for larger building projects, e.g. power stations, dams or high-rise buildings or can be used for nuclear and CO2 storage monitoring, geothermal projects and mining exploration. The hydrophone string BHC1000 is a fully digitized borehole tool and consists of a downhole digitization unit, 24 hydrophones moulded to a multicore cable, the BHC1000 surface unit and acquisition soware. The BHC1000 runs on a standard 4-conductor logging cable. The communication is made via a RS485 interface.