 HOUSTON, March 10, 2021 GLOBE NEWSWIRE -- ION Geophysical Corporation ION or the Company NYSE: IO today announced it has commenced an offer to exchange the Exchange Offer any and all of its outstanding 9.125 Senior Secured Second Priority Notes due 2021 the Old Notes for its new 8.00 Senior Secured Second Priority Notes due 2025 the New Notes and the other consideration described below, upon the terms and subject to the conditions set forth in its prospectus dated today the Prospectus and, together with the related letter of transmittal, the Offering Materials and filed with the Securities and Exchange Commission the SEC. 