Document:

First Supplemental Indenture dated as of December 3, 2012

 Exhibit 4.2 
 FIRST SUPPLEMENTAL INDENTURE 
 This FIRST
SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) is dated as of December 3, 2012, among PT. Vantage Drilling Company Indonesia (the “Guaranteeing Subsidiary”), a subsidiary
of Vantage Drilling Company, a Cayman Islands exempted company (the “Parent”), Offshore Group Investment Limited, a Cayman Islands exempted company (the “Company”), the other Guarantors (as defined in the Indenture
referred to herein) and Wells Fargo Bank, National Association, as Trustee under the Indenture referred to below (the “Trustee”). 
 WITNESSETH 
 WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the “Indenture”), dated as of October 25, 2012 providing for the issuance of 7.5% Senior Secured First Lien Notes due 2019 (the “Notes”); 

WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiary shall execute and deliver to the Trustee a
supplemental indenture pursuant to which the Guaranteeing Subsidiary shall unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein (the “Note
Guarantee”); and 
 WHEREAS, pursuant to Section 9.01 (“Without Consent of Holders”) of the Indenture,
the Trustee is authorized to execute and deliver this Supplemental Indenture. 
 NOW, THEREFORE, in consideration of the
foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

 1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings
assigned to them in the Indenture. 
 2. AGREEMENT TO GUARANTEE. The Guaranteeing
Subsidiary hereby agrees to provide an unconditional Note Guarantee on the terms and subject to the conditions set forth in the Note Guarantee and in the Indenture including but not limited to Article 11 thereof, and subject to the limitations
therein. 
 3. NO RECOURSE AGAINST OTHERS. No director, officer,
employee, incorporator or stockholder of the Company or any Guarantor, as such, will have any liability for any obligations of the Company or the Guarantors under the Notes, the Indenture or the Note Guarantees or for any claim based on, in respect
of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver may not be effective to waive
liabilities under the federal securities laws. 

 4. NEW YORK LAW TO GOVERN. THE LAWS OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO
CONSTRUE THIS SUPPLEMENTAL INDENTURE. 
 5. COUNTERPARTS. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. 
 6.
EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof. 
 7. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in
respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiary and the Company. 

  
 -2-

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed as of the day and year written above. 
  

			
	 OFFSHORE GROUP INVESTMENT LIMITED,
 as the Company

		
	 By:
	 	 /s/ Douglas G. Smith

		 	Name:
		 	 Title:

  

			
	VANTAGE DRILLING COMPANY,
	as Parent and as a Guarantor
		
	 By:
	 	 /s/ Douglas G. Smith

		 	Name:
		 	 Title:

  

					
	PT. VANTAGE DRILLING COMPANY INDONESIA, as Guarantor
		
	 By:
	 	 /s/ David C. Tait

		 	Name:	 	David C. Tait
		 	Title:	 	Director

  

					
	VANTAGE HOLDING HUNGARY KFT, as Guarantor
		
	 By:
	 	 /s/ Linda Ibrahim

		 	Name:	 	Linda Ibrahim
		 	Title:	 	Managing Director

  

					
	By:	 	 /s/ Julia Varga

		 	Name:	 	Julia Varga
		 	Title:	 	Managing Director

 [Signature Page to First Supplemental Indenture] 

 
					
	VANTAGE INTERNATIONAL MANAGEMENT CO., as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	VANTAGE DRILLING NETHERLANDS BV, as Guarantor
		
	By:	 	/s/ Linda Jovana Ibrahim
		 	  

		 	Name:	 	Linda Jovana Ibrahim
		 	Title:	 	Managing Director A

  

					
	By:	 	/s/ TMF Management B.V.
		 	  

		 	Name:	 	TMF Management B.V.
		 	Title:	 	Managing Director B

  

					
	P2021 RIG CO., as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	P2020 RIG CO., as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	VANTAGE DRILLER I CO, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

 [Signature Page to First Supplemental Indenture] 

 
					
	VANTAGE DRILLER II CO, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	VANTAGE DRILLER III CO, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	VANTAGE DRILLER IV CO., as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	SAPPHIRE DRILLER COMPANY, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

  

					
	EMERALD DRILLER COMPANY, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name:	 	Douglas G. Smith
		 	Title:	 	Chief Financial Officer and Treasurer

 [Signature Page to First Supplemental Indenture] 

 
			
	 VANTAGE HOLDINGS MALAYSIA I CO.,
 as Guarantor

		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name: Douglas G. Smith
		 	Title:   Chief Financial Officer and Treasurer
	
	VANTAGE DRILLING (MALAYSIA) I SDN.
BHD., as Guarantor
		
	By:	 	/s/ Ronald Nelson
		 	  

		 	Name: Ronald Nelson
		 	Title:   Director
	
	 VANTAGE DRILLING LABUAN I LTD.,
 as Guarantor

		
	By:	 	/s/ Ronald Nelson
		 	  

		 	Name: Ronald Nelson
		 	Title:   Director
	
	 DRAGONQUEST HOLDINGS COMPANY,
 as Guarantor

		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name: Douglas G. Smith
		 	Title:   Chief Financial Officer and Treasurer
	
	VANTAGE DRILLING POLAND –
LUXEMBOURG BRANCH, as Guarantor
		
	By:	 	/s/ Ian Foulis
		 	  

		 	Name: Ian Foulis
		 	Title:   Branch Manager

 [Signature Page to First Supplemental Indenture] 

 
			
	VANTAGE HOLDINGS CYPRUS ODC LIMITED, as Guarantor
		
	By:	 	/s/ Mark Howell
		 	  

		 	Name: Mark Howell
		 	Title:   Director
	
	VANTAGE DEEPWATER COMPANY, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name: Douglas G. Smith
		 	Title:   Chief Financial Officer and Treasurer
	
	VANTAGE DEEPWATER DRILLING INC., as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name: Douglas G. Smith
		 	Title:   Chief Financial Officer and Treasurer
	
	TUNGSTEN EXPLORER COMPANY, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name: Douglas G. Smith
		 	Title:   Chief Financial Officer and Treasurer
	
	VANTAGE DELAWARE HOLDINGS, LLC, as Guarantor
		
	By:	 	/s/ Douglas G. Smith
		 	  

		 	Name: Douglas G. Smith
		 	Title:   Chief Financial Officer and Treasurer

 [Signature Page to First Supplemental Indenture] 

 
			
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	/s/ Patrick T. Giordano
		 	  

		 	Name: Patrick T. Giordano
		 	Title:   Vice President

 [Signature Page to First Supplemental Indenture]Joinder Agreement dated as of December 3, 2012

 Exhibit 10.1 
 JOINDER AGREEMENT 
 THIS JOINDER AGREEMENT (this
“Agreement”), dated as of December 3, 2012, is entered into between PT VANTAGE DRILLING COMPANY INDONESIA, a limited liability company organized under the laws of the Republic of Indonesia (the “New
Subsidiary”) and CITIBANK, N.A. as administrative agent (the “Administrative Agent”) under that certain Term Loan Agreement, dated as of October 25, 2012 (as the same may be amended, modified, extended or restated from
time to time, the “Term Loan Agreement”) among Offshore Group Investment Limited, a Cayman Islands exempted company (the “Administrative Borrower”), Vantage Delaware Holdings, LLC, a Delaware limited liability
company (the “US Borrower” and, together with the Administrative Borrower, the “Borrowers”), the Lenders from time to time party thereto, the Administrative Agent and Wells Fargo, National Association, as collateral
agent (the “Collateral Agent” and, together with the Administrative Agent, the “Agents”). All capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Term Loan Agreement.

 The New Subsidiary and the Administrative Agent hereby agree as follows: 

1. The New Subsidiary hereby acknowledges, agrees and confirms that, by its execution of this Agreement, the New Subsidiary will be deemed
to be a Credit Party under the Term Loan Agreement and a Guarantor for all purposes of the Term Loan Agreement and shall have all of the obligations of a Credit Party and a Guarantor thereunder as if it had executed the Term Loan Agreement. The New
Subsidiary hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and conditions contained in the Term Loan Agreement, including without limitation (a) all of the representations and warranties of the
Credit Parties set forth in Article III of the Term Loan Agreement, (b) all of the covenants set forth in Article VI of the Term Loan Agreement and (c) all of the guarantee obligations set forth in Article IX of the Term Loan Agreement.
Without limiting the generality of the foregoing terms of this paragraph 1, the New Subsidiary hereby guarantees, jointly and severally with the other Guarantors, to each Agent and the Lenders, as provided in Article IX of the Term Loan Agreement,
the prompt payment of the Loan Obligations in full when due (whether at stated maturity, as a mandatory prepayment, by acceleration or otherwise) strictly in accordance with the terms thereof and agrees that if any of the Loan Obligations are not
paid in full when due (whether at stated maturity, as a mandatory prepayment, by acceleration or otherwise), the New Subsidiary will, jointly and severally together with the other Guarantors, promptly pay the same and that in the case of any
extension of time of payment or renewal of any of the Loan Obligations, the same will be promptly paid in full when due (whether at extended maturity, as a mandatory prepayment, by acceleration or otherwise) in accordance with the terms of such
extension or renewal. 
 2. If required, the New Subsidiary is, simultaneously with the execution of this Agreement, executing
and delivering such Security Documents (and such other documents and instruments) as requested by the Administrative Agent or the Collateral Agent in accordance with the Term Loan Agreement. 

3. The address of the New Subsidiary for purposes of Section 10.02 of the Term Loan Agreement is as follows: 

Graha Mampang Building, 5th Floor 
 JI. Mampang Prapatan Rya No. 100 Kel. Duren Tiga, Kec. Pancoran Jakarta Selatan 
 Indonesia 
 4. The New Subsidiary hereby waives acceptance by any Secured
Party of the guarantee by the New Subsidiary upon the execution of this Agreement by the New Subsidiary. 
 5. This Agreement
may be executed in any number of counterparts, each of which when so executed and delivered shall be an original, but all of which shall constitute one and the same instrument. 

6. THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 
 [Signature Pages Follow] 

 IN WITNESS WHEREOF, the New Subsidiary has caused this Agreement to be duly executed by its
authorized officer and the Administrative Agent has caused the same to be accepted by its authorized officer, as of the day and year first above written. 

 

			
	PT. VANTAGE DRILLING COMPANY INDONESIA
		
	By:	 	/s/ David Tait
		 	  

	Name:	 	David Tait
	Title:	 	Director

 [Signature Page to Term Loan Joinder Agreement] 

			
	Acknowledged and accepted:
	
	CITIBANK, N.A.
		
	By:	 	/s/ Christopher Abbate
		 	  

	Name:	 	Christopher Abbate
	Title:	 	Vice President

 [Signature Page to Term Loan Joinder Agreement]

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