EXHIBIT 21(a) SUBSIDIARIES OF HORNBECK OFFSHORE SERVICES, INC. Hornbeck Offshore Operators, Inc. Hornbeck Offshore (GP-1984) Inc. Hornbeck Offshore (1984) Corporation Hornbeck Offshore (1989) Corporation Hornbeck Offshore (1991) Corporation Hornbeck Offshore (1991-II) Corporation Hornbeck Offshore (1992) Corporation Hornbeck Offshore (1992-II) Corporation Hornbeck Offshore (1992-III) Corporation Hornbeck Offshore (1992-IV) Corporation Hornbeck Offshore (1992-V) Corporation Hornbeck Holdings (1992) Corporation Hornbeck Offshore (1993) Corporation Hornbeck Offshore (1994-I) Corporation Hornbeck Offshore (1994-II) Corporation Hornbeck Offshore (1994-III) Corporation Hornbeck Offshore (1994-IV) Corporation Hornbeck North Sea Safety, Inc. Point Marine, Inc. T. Benetee Corporation Each of the above subsidiaries is a Delaware corporation except for Point Marine, Inc., which is a Louisiana corporation.