4.2 Form of 10.000% Senior Secured Second Lien Notes due 2019 (included in Exhibit 4.1). 4.3 Notation of Guarantee executed July 27, 2016, among SAExploration Sub, Inc., SAExploration, Inc., SAExploration Seismic Services (US), LLC and NES, LLC. For internal use only SDNY_GM_00059825 CONFIDENTIAL - PURSUANT TO FE