JOINT FILLING AGREEMENT

                                                             Page 11 of 11 Pages

                                    EXHIBIT B

                             JOINT FILLING AGREEMENT

The undersigned  hereby agree that the statement on Schedule 13G with respect to
the Common Stock of Viatel,  Inc.  dated January 11, 1999 is, and any amendments
thereto (including amendments on Schedule 13D) signed by each of the undersigned
shall  be,  filed  on  behalf  of us  pursuant  to and in  accordance  with  the
provisions of Rule 13d-1(f) under the Securities Exchange Act of 1934.



Date:  January 11, 1999            S-C V-TEL INVESTMENTS, L.P.

                                   By:      S-C Rig Co.
                                            General Partner


                                   By:       /S/ XXXXX XXXXXXX
                                             -----------------------------------
                                             Xxxxx Xxxxxxx
                                             Vice President


                                   S-C RIG CO.


                                   By:       /S/ XXXXX XXXXXXX
                                             -----------------------------------
                                             Xxxxx Xxxxxxx
                                             Vice President


                                   XXXXXXXX XXXXXXXXXX


                                   By:       /S/ XXXXX XXXXXXX
                                             -----------------------------------
                                             Xxxxx Xxxxxxx
                                             Attorney-in-Fact


                                   XXXXXX XXXXX


                                   By:       /S/ XXXXXXX X. XXXX
                                             -----------------------------------
                                             Xxxxxxx X. Xxxx
                                             Attorney-in-Fact