**Exhibit 31.2****Section 302 Certification**I, Ronald D. Mogel, certify that:     1. I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2005 ofHorizon Offshore, Inc.;     2. Based on my knowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to the periodcovered by this report;     3. Based on my knowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financial condition, results ofoperations and cash flows of the registrant as of, and for, the periods presented in this report;     4. The registrant’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules13a-15(f) and 15d-15(f)) for the registrant and have:     (a) Designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under oursupervision, to ensure that material information relating to theregistrant, including its consolidated subsidiaries, is made knownto us by others within those entities, particularly during theperiod in which this report is being prepared;     (b) Designed such internal control over financial reporting, orcaused such internal control over financial reporting to be designedunder our supervision, to provide reasonable assurance regarding thereliability of financial reporting and the preparation of financialstatements for external purposes in accordance with generallyaccepted accounting principles;     (c) Evaluated the effectiveness of the registrant’s disclosurecontrols and procedures and presented in this report our conclusionsabout the effectiveness of the disclosure controls and procedures,as of the end of the period covered by this report based on suchevaluation; and     (d) Disclosed in this report any change in the registrant’s internalcontrol over financial reporting that occurred during theregistrant’s most recent fiscal quarter (the registrant’s fourthfiscal quarter in the case of an annual report) that has materiallyaffected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and     5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’s auditors and the auditcommittee of the registrant’s board of directors (or persons performing the equivalent functions):     (a) All significant deficiencies andmaterial weaknesses in the design oroperation of internal control over financialreporting which are reasonably likely toadversely affect the registrant’s ability torecord, process, summarize and reportfinancial information; and     (b) Any fraud, whether or not material, thatinvolves management or other employees whohave a significant role in the registrant’sinternal control over financial reporting.
Date: March 14, 2006                                    /s/ Ronald D. Mogel    Ronald D. Mogel   *Vice President and*