EXHIBIT 10(mm)

                    THIRD AMENDMENT TO EMPLOYMENT AGREEMENT


Tuboscope Vetco International Inc., a Texas corporation (the "Company"),
Tuboscope Vetco International Corporation, a Delaware corporation (the
"Corporation"), and Gerhard H. Hage, Jr. (the "Executive") have previously
entered into a General Manager Employment Agreement dated as of October 16, 1989
as amended April 30, 1992 and June 23, 1993 (the "Amended Agreement"). The
Company and the Corporation are hereinafter sometimes jointly referred to as
"the Companies."

WHEREAS, the Companies are contemplating a transaction pursuant to which the
Companies would combine their business enterprises with those of another
company; (the contemplated transaction is hereinafter referred to as the
"Transaction"); and

WHEREAS, the Companies and Executive wish to modify the Amended Agreement in
certain respects generally and in particular respects in contemplation of the
Transaction;

NOW, THEREFORE, in consideration of the premises and mutual promises contained
herein the sufficiency and receipt of which are hereby acknowledged the parties
agree as set forth below:

1.   Paragraph 3 of the Amended Agreement is amended to read hereafter as
     follows:

     "In the event of Change of Control, all of Executive's unvested stock
     options shall vest without further action by either of the Companies or
     Executive. Notwithstanding anything to the contrary contained in the
     agreements covering such stock options, such stock options shall be
     exercisable for the two (2) full calendar years following the Executive's
     termination of employment with the Companies pursuant to the other terms of
     the Amended and Restated Stock Option Plan for Key Employees and Directors
     of Tuboscope Vetco International Corporation."

 
                                                                  EXHIBIT 10(mm)

IN WITNESS WHEREOF, the Company, the Corporation, and the Executive have
executed this Agreement on this 3rd day of January, 1996.

EXECUTIVE                               TUBOSCOPE VETCO INTERNATIONAL INC.


/s/  GERHARD H. HAGE, JR.               By: /s/  MARTIN R. REID             
- ------------------------------              ------------------------------- 
Gerhard H. Hage, Jr.                             Martin R. Reid            
                                                 Chairman of the Board      

                                        TUBOSCOPE VETCO INTERNATIONAL
                                        CORPORATION


                                        By: /s/  MARTIN R. REID            
                                                 Martin R. Reid           
                                            -------------------------------
                                                 Chairman of the Board

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