London, 16 September 2016 -- Moody's Investors Service has downgraded to B3 from B2 and B3-PD from B2-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. Concurrently all the ratings have been placed on review for further downgrade.

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