London, 24 January 2017 -- Moody's Investors Service has downgraded to Caa1 from B3 and to Caa3-PD from B3-PD, respectively, the corporate family rating (CFR) and probability of default rating (PDR) of IG Seismic Services Plc (IGSS), the leading seismic services company in Russia. The outlook on all the ratings has been changed to stable from negative.

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