UNITED STATES  SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Exact name of registrant as specified in its charter)  Tidewater Inc.  72-048776 (I.R.S. Employer Identification No.) Delaware (State of incorporation)  601 Poydras St., Suite 1900 New Orleans, Louisiana (Address of principal executive offices)  70130 (Zip Code)  Title of each class  Common Stock, par value $0.10  Name of each exchange on which registered New York Stock Exchange  Registrant’s telephone number, including area code: (504) 568-1010  Securities registered pursuant to Section 12(b) of the Act:  Securities registered pursuant to Section 12(g) of the Act: None  Commission file number: 1-6311  _ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934  For the fiscal year ended March 31, 2010  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXHANGE ACT OF  1934 For the transition period from ______ to _______. Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the  Securities Act. Yes  :  No  Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d)  of the Act. Yes   No  : Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or  15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period  that the registrant was required to file such reports), and (2) has been subject to such filing requirements for  the past 90 days. Yes  :  No  Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web  site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of  Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that  the registrant was required to submit and post such files). Yes   No  Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405  of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in  definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any  amendment to this Form 10-K.  -1- 