1 EXHIBIT 4.1 AMENDMENT NO. 1 TO RIGHTS AGREEMENT Amendment No. 1, dated as of May 23, 2001, to the Rights Agreement, dated as of November 15, 1996 (the "Rights Agreement"), between Marine Drilling Companies, a Texas corporation (the "Company"), and...Rights Agreement • May 25th, 2001 • Marine Drilling Companies Inc • Drilling oil & gas wells • Texas
RECITALSStock Option Agreement • May 25th, 2001 • Marine Drilling Companies Inc • Drilling oil & gas wells • Texas
1 EXHIBIT 2.1 AGREEMENT AND PLAN OF MERGERAgreement and Plan of Merger • May 25th, 2001 • Marine Drilling Companies Inc • Drilling oil & gas wells • Texas
