UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 28, 2007

HORIZON OFFSHORE, INC.

(Exact name of registrant as specified in its charter)


Delaware (State or other jurisdiction of incorporation)		001-16857 (Commission File Number)		72-0487309 (IRS Employer Identification No.)


2500 CityWest Boulevard, Suite 2200, Houston, Texas (Address of principal executive offices)		77042 (Zip Code)

(713) 361-2600
(Registrant’s telephone number, including area code)

Not Applicable
(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligations of the registrant under any of the following provisions:

þ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

þ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01 Other Events.

On September 28, 2007, Horizon Offshore, Inc. issued a joint press release with Cal Dive International, Inc. announcing that each company had received a request for additional information from the Antitrust Division of the U.S. Department of Justice regarding Horizon’s pending acquisition by Cal Dive. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.



99.1		Press release issued jointly by Horizon Offshore, Inc. and Cal Dive International, Inc. dated September 28, 2007.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


	HORIZON OFFSHORE, INC.
	By:	/s/ Ronald D. Mogel
		Ronald D. Mogel
		Vice President and Chief Financial Officer

Date: October 1, 2007

Exhibit Index


Exhibit
Number		Description

99.1		Press release issued jointly by Horizon Offshore, Inc. and Cal Dive International, Inc. dated September 28, 2007.

HORIZON OFFSHORE INC 8-K