Exhibit 4.1




                                                                  EXECUTION COPY










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                          LEVEL 3 COMMUNICATIONS, INC.

                                       AND

                              THE BANK OF NEW YORK
                                   as Trustee

                -------------------------------------------------

                             AMENDMENT NO. 1 TO THE

                          THIRD SUPPLEMENTAL INDENTURE

                            DATED AS OF JUNE 18, 2003

                -------------------------------------------------



       Amendment to Supplement to Indenture dated as of September 20, 1999
                         (Subordinated Debt Securities)

                9% Junior Convertible Subordinated Notes due 2012




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               AMENDMENT NO. 1 TO THE THIRD SUPPLEMENTAL INDENTURE

     THIS   AMENDMENT  NO.  1  TO  THE  THIRD   SUPPLEMENTAL   INDENTURE   (this
"Amendment"),  dated as of June 18, 2003, by and between LEVEL 3 COMMUNICATIONS,
INC., a Delaware corporation (hereinafter called the "Company"), and THE BANK OF
NEW YORK as successor to IBJ WHITEHALL BANK & TRUST COMPANY,  a New York banking
corporation (hereinafter called the "Trustee"),  having a Corporate Trust Office
at 101 Barclay Street,  Floor 8 West, New York, New York 10286, as Trustee under
the Indenture (as hereinafter defined).

                                    RECITALS

     WHEREAS,  the Company and the Trustee have as of September 20, 1999 entered
into an Indenture (as supplemented, the "Indenture"), providing for the issuance
by the Company from time to time of its subordinated debt securities;

     WHEREAS, the Company and the Trustee have as of July 8, 2002 entered into a
Third Supplemental Indenture (the "Supplemental  Indenture"),  providing for the
issuance by the Company of up to $500,000,000  aggregate principal amount of its
9% Junior Convertible Subordinated Notes due 2012 (the "Notes");

     WHEREAS,  Section 902 of the Indenture  provides,  among other things, that
the  Company,  with the  consent of the  Holders of not less than a majority  in
principal  amount of all Outstanding  Securities  affected by such  supplemental
indenture, by Act of said Holders delivered to the Company and the Trustee, when
authorized by or pursuant to a Board Resolution,  and the Trustee may enter into
an indenture or supplemental  indentures for the purpose of adding any provision
to or  changing  in any  manner  or  eliminating  any of the  provisions  of the
Indenture, including amending the conversion provisions, provided, however, that
no such supplemental  indenture shall, without the consent of the Holder of each
Outstanding  Security affected  thereby,  impair the right of Holders to convert
their  Securities upon the terms  established  pursuant to or in accordance with
the provisions of the Indenture or modify Article  Seventeen of the Indenture in
a manner adverse to the Holders;

     WHEREAS,  the Company has received the written consents of the Holders of a
majority  of the  aggregate  principal  amount of the  Notes to enter  into this
Amendment;

     WHEREAS,  the Company  desires to enter into this  Amendment,  and has duly
authorized   the  execution  and  delivery  of  this  Amendment  to  modify  the
Supplemental Indenture;

     WHEREAS, concurrent with the execution hereof, the Company has delivered an
Officers'  Certificate  and has caused its  counsel to deliver to the Trustee an
Opinion of Counsel or a reliance letter upon an opinion of counsel; and

     WHEREAS, all conditions and requirements of the Indenture necessary to make
this  Amendment a valid,  binding and legal  instrument in  accordance  with its
terms have been  performed and fulfilled by the parties hereto and the execution
and delivery  thereof have been in all respects  duly  authorized by the parties
hereto.


     NOW, THEREFORE:

     For and in  consideration  of the mutual  premises  and  agreements  herein
contained,  the Company and the Trustee  covenant  and agree,  for the equal and
proportionate benefit of all Holders of the Securities, as follows:

                                  ARTICLE One

                    AMENDMENTS TO THE SUPPLEMENTAL INDENTURE

SECTION 1.1.      DEFINITIONS.

     (a) Capitalized  terms used herein and not otherwise defined shall have the
respective  meanings  assigned  thereto  in the  Indenture  or the  Supplemental
Indenture, as applicable.

     (b) The  following  definitions  are hereby added to Section  1.7(c) of the
Supplemental Indenture in appropriate alphabetical position:

          "Special  Conversion  Period"  shall  mean the  period  from 5:00 p.m,
     Eastern  Standard Time, on the date hereof to 9:15 a.m.,  Eastern  Standard
     Time, on the next Business Day after the date hereof.

          "Special Conversion Price" shall equal $2.83849.

SECTION 1.2.      FORM OF SECURITIES.

     (a) The Form of Reverse of Notes is hereby  amended by adding the following
immediately prior to the heading "Mandatory Conversion":

     "During the Special Conversion Period, the Holder of this Note is entitled,
at his or her option, to convert each $1,000 principal amount of Notes into such
number of fully paid and nonassessable  shares of Common Stock of the Company as
shall be  determined  by  dividing  $1,000 by the  Special  Conversion  Price by
surrender  of (1) this Note,  duly  endorsed  or  assigned  to the Company or in
blank, and (2) the Special  Conversion Notice attached hereon duly executed,  to
the  Company at the  Corporate  Trust  Office of the  Trustee,  or at such other
office or agency of the Company as the Company may designate. No cash payment or
adjustment  is to be made on  conversion  for interest  accrued  hereon from the
Interest Payment Date next preceding the day of conversion,  or for dividends on
the Common Stock of the Company issued on conversion  hereof.  The Company shall
thereafter  deliver to the Holder the fixed  number of shares of Common Stock of
the Company into which this Note is convertible and such delivery will be deemed
to satisfy the Company's obligation to pay the principal amount of this Note. No
fractions  of shares or scrip  representing  fractions  of shares will be issued
upon conversion,  but instead of any fractional interest the Company shall round
upward  to the next  whole  number  of shares  of  Common  Stock  issuable  upon
conversion."

     (b) The Form of Reverse of Notes is hereby  amended by inserting  Exhibit A
attached hereto after the "Option of Holder to Elect Purchase Certificate."


     SECTION 1.3. CONVERSION RATE. Section 2.2 of the Supplemental  Indenture is
hereby amended by inserting  "(a)" after the heading and by adding the following
as a new paragraph at the end of Section 2.2:

     "(b)  During the Special  Conversion  Period,  the rate at which  shares of
Common Stock of the Company  shall be delivered  upon  conversion  (the "Special
Conversion  Rate") of each $1,000  principal amount of Notes shall be determined
by dividing $1,000 by the Special Conversion Price."

                                  ARTICLE Two

                                  MISCELLANEOUS

     SECTION  2.1.  APPLICATION  OF THIS  AMENDMENT.  Each  and  every  term and
condition  contained in this Amendment that modifies,  amends or supplements the
terms and  conditions of the Indenture  shall apply only to the Notes created by
the  Supplemental  Indenture and not to any future  series of notes  established
under the Indenture.

     SECTION  2.2.  BENEFITS  OF  THIS  AMENDMENT.  Nothing  contained  in  this
Amendment  shall or shall be  construed  to confer upon any person  other than a
Holder of the Notes,  the Company and the Trustee any right or interest to avail
itself or himself, as the case may be, of any benefit under any provision of the
Indenture, the Supplemental Indenture or this Amendment.

     SECTION 2.3.  EFFECTIVE  DATE.  This Amendment shall be effective as of the
date first above written and upon the  execution and delivery  hereof by each of
the parties hereto.

     SECTION  2.4.  GOVERNING  LAW.  This  Amendment  shall be governed  by, and
construed in accordance with, the laws of the State of New York.

     SECTION 2.5. COUNTERPARTS.  This Amendment may be executed in any number of
counterparts, including via facsimile, each of which so executed shall be deemed
to be an original,  but all such counterparts shall together  constitute but one
and the same instrument.



                  [Remainder of Page Intentionally Left Blank]




                          [Signature Page to Amendment]

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be
duly executed by their respective  officers hereunto duly authorized,  all as of
the day and year first above written.

                               LEVEL 3 COMMUNICATIONS, INC.


                               By: /s/ Thomas C. Stortz
                                   Name:       Thomas C. Stortz
                                   Title:      Group Vice President



                               THE BANK OF NEW YORK, as Trustee


                               By: /s/ Van K. Brown
                                   Name:       Van K. Brown
                                   Title:      Vice President







                                                                       EXHIBIT A



                            SPECIAL CONVERSION NOTICE

     The undersigned Holder of this Note hereby irrevocably exercises the option
to convert this Note,  or any portion of the  principal  amount hereof (which is
$1,000 or an integral  multiple of $1,000 in excess  thereof,  PROVIDED that the
unconverted  portion of such principal amount is $1,000 or any integral multiple
of $1,000 in excess  thereof) below  designated,  into shares of Common Stock of
the Company in accordance  with the terms of the  Indenture  referred to in this
Note, and directs that such shares and any Notes  representing  any  unconverted
principal  amount  hereof,  be delivered to and be registered in the name of the
undersigned.  The undersigned acknowledges and agrees that such shares of Common
Stock shall be issued on or before June 27, 2003. Concurrently with the delivery
of this Special Conversion Notice, a Certificate of Beneficial Owner in the form
attached as Schedule I hereto  executed by the beneficial  owner of this Note is
being delivered to the Company.

Dated: ____________



Signature(s):

Name:             ____________________________

Address: ____________________________

                  ____________________________

Name:             ____________________________

Address: ____________________________

                  ____________________________

Signature Guaranteed:

__________________________________
Participant in a Recognized Signature
Guarantee Medallion Program

By:  ______________________________
                Authorized Signatory

If only a portion of this Note is to be converted, please indicate:
1.  Principal amount to be converted:  $
2.  Principal amount and denomination of Notes representing unconverted
     principal amount to be issued:  $


     ($1,000 or any integral multiple of $1,000 in excess thereof, provided that
the  unconverted  portion  of such  principal  amount is $1,000 or any  integral
multiple of $1,000 in excess thereof)






                                                                      Schedule I

                         CERTIFICATE OF BENFICIAL OWNER

     The  undersigned  beneficial  owner (the "Owner") of Notes issued under the
Indenture,  dated  as of  September  20,  1999,  as  supplemented  by the  First
Supplemental Indenture,  dated as of September 20, 1999, the Second Supplemental
Indenture,  dated as of February 29,  2000,  the Third  Supplemental  Indenture,
dated  as of July  8,  2002,  and  Amendment  No.  1 to the  Third  Supplemental
Indenture  (the  "Amendment"),  dated  as of  June  18,  2003,  between  Level 3
Communications,  Inc. (the "Company"),  and The Bank of New York, as Trustee (as
supplemented and amended,  the "Indenture") has on the date hereof exercised its
option to convert its Notes or a portion of the  principal  amount  thereof into
shares  of  Common  Stock of the  Company  in  accordance  with the terms of the
Indenture  pursuant to the Special  Conversion  Notice,  dated the date  hereof,
delivered to the Company by the undersigned Owner or by its nominee on behalf of
the undersigned Owner.

     In  connection  with  the  above   referenced   conversion  of  Notes,  the
undersigned Owner hereby represents and warrants to the Company as follows:

     (a) Such  Owner  taken  together  with  the  other  Owners  of Notes do not
constitute a "group"  within the meaning of Section  13(d)(3) of the  Securities
Exchange Act of 1934, as amended (the  "Exchange  Act").  Such Owner is not and,
after giving effect to the  conversion of its Note or a portion of the principal
amount thereof,  will not be an Affiliate of the Company. Such Owner agrees that
it shall not take any actions  such that the Owner of the Notes may be deemed to
be a "group"  under Section  13(d)(3) of the Exchange  Act. Such Owner  together
with all of its Affiliates will  beneficially own (as defined in Rules 13d-3 and
13d-5 under the Exchange Act) less than twenty  percent  (20%)1 of the Company's
outstanding Common Stock.

     (b) Such Owner,  or its "ultimate  parent  entity" (as defined by 16 C.F.R.
SEC801.1(a)(3)),  if any,  is a different  "acquiring  person" (as defined by 16
C.F.R.  SEC801.2(a))  from all other  Holders  and  Owners  and has a  different
"ultimate parent entity" (as defined by 16 C.F.R. SEC801.1(a)(3)) than all other
Holders and Owners.

     (c)  Such  Owner,  or  its  "ultimate   parent  entity",   if  any,  is  an
"institutional  investor" (as defined by 16 C.F.R.  SEC802.64(a)) and any entity
controlled by such Owner, or its "ultimate  parent  entity",  if any, that holds
voting securities of the Company is an "institutional investor".

     (d) Such Owner, or its "ultimate  parent entity",  if any, is acquiring the
Common Stock  issuable on  conversion  of its Note or a portion of the principal
amount thereof (i) for its own account,  (ii) in the ordinary course of business
and (iii)  "solely  for the  purpose  of  investment"  (as  defined by 16 C.F.R.
SEC801.1(i)(1)),  and as a  result  of  such  acquisition,  such  Owner,  or its
"ultimate  parent  entity",  if any,  including  the holdings of its  controlled
subsidiaries,  will hold fifteen percent (15%) or less of the outstanding voting
securities of the Company.


     Capitalized  terms used  herein and not  otherwise  defined  shall have the
meaning ascribed to them in the Amendment.

                            [Signature Page Follows]







     IN  WITNESS  WHEREOF,  the  undersigned  has  caused  this  Certificate  of
Beneficial  Owner to be duly executed by its respective  officers  hereunto duly
authorized, as of the __ day of the June, 2003.



                                          By:
                                          Name:
                                          Title



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1 In the case of National Indemnity Co., the threshold shall be 15%.