FILED BY ENSCO INTERNATIONAL INCORPORATED PURSUANT TO RULE 425 UNDER THE SECURITIES ACT OF 1933 AND DEEMED FILED PURSUANT TO RULE 14a-12(b) OF THE SECURITIES EXCHANGE ACT OF 1934 SUBJECT COMPANY: CHILES OFFSHORE INC. SUBJECT COMPANY COMMISSION FILE NO.: 001-16005 Date: May 16, 2002 The merger agreement with respect to ENSCO International Incorporated's acquisition of Chiles Offshore Inc. was filed by ENSCO International Incorporated under cover of Form 8-K today and is incorporated by reference into this filing. THIS ANNOUNCEMENT DOES NOT CONSTITUTE AN OFFER OF ANY SECURITIES FOR SALE OR AN OFFER OR AN INVITATION TO PURCHASE ANY SECURITIES. INVESTORS SHOULD CAREFULLY REVIEW ENSCO INTERNATIONAL INCORPORATED'S REGISTRATION STATEMENT AND PROSPECTUS AND THE RELATED CHILES OFFSHORE INC. PROXY STATEMENT WITH RESPECT TO THE PROPOSED TRANSACTION WHEN THEY ARE FILED WITH THE SEC BEFORE MAKING ANY DECISION CONCERNING THE PROPOSED OFFER. THESE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION. ONCE FILED, INVESTORS WILL BE ABLE TO OBTAIN THESE DOCUMENTS AND OTHER RELEVANT DOCUMENTS FOR FREE AT THE SEC'S WEB SITE http://WWW.SEC.GOV, AND AT ENSCO INTERNATIONAL INCORPORATED'S WEB SITE, http://WWW.ENSCOUS.COM, OR CHILES OFFSHORE INC.'S WEB SITE, http://WWW.CHILESOFFSHORE.COM. INVESTORS SHOULD READ THE PROXY STATEMENT/PROSPECTUS CAREFULLY BEFORE MAKING A DECISION CONCERNING THE TRANSACTION. PARTICIPANTS IN SOLICITATION CHILES OFFSHORE INC. AND ITS RESPECTIVE DIRECTORS AND EXECUTIVE OFFICERS MAY BE DEEMED TO BE PARTICIPANTS IN THE SOLICITATION OF PROXIES FROM CHILES OFFSHORE INC.'S SHAREHOLDERS IN CONNECTION WITH THE PROPOSED MERGER. INFORMATION CONCERNING CHILES OFFSHORE INC.'S PARTICIPANTS IN THE SOLICITATION IS SET FORTH IN CHILES OFFSHORE INC.'S FORM 10-K FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 29, 2002.