.
                                                                               .
                                                                               .
                                                                    EXHIBIT 21.1

                         SUBSIDIARIES OF THE REGISTRANT

<Table>
<Caption>
                      Subsidiary                                             State of Incorporation
- -----------------------------------------------------                  -----------------------------------
                                                                    
     Universal Fabricators, LLC                                                     Louisiana
     Unifab International West, LLC                                                 Louisiana
     Allen Process Systems, LLC                                                     Louisiana
     Latoka USA, Inc.                                                               Delaware
     Oil Barges, Inc.                                                               Louisiana
     Superior Derrick Services of Texas, LLC                                          Texas
</Table>