Document:

EX-4.1

 Exhibit 4.1 
 SECOND SUPPLEMENTAL INDENTURE 
 This SECOND
SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of May 22, 2013, among Vantage Driller VI Co. (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/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLING COMPANY, as Parent and as a Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  

			
	VANTAGE DRILLER VI CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	PT. VANTAGE DRILLING COMPANY INDONESIA, as Guarantor
		
	By:	 	 /s/ David Tait

		 	Name: David Tait
		 	Title: Director

  
 [Signature
Page to Second Supplemental Indenture] 

 
			
	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
	
	VANTAGE INTERNATIONAL MANAGEMENT CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

 

			
	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/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to Second Supplemental Indenture] 

 
			
	P2020 RIG CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Secretary
	
	VANTAGE DRILLER I CO, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER II CO, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER III CO, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER IV CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to Second Supplemental Indenture] 

 
			
	SAPPHIRE DRILLER COMPANY, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	EMERALD DRILLER COMPANY, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE HOLDINGS MALAYSIA I CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	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

  
 [Signature
Page to Second Supplemental Indenture] 

 
			
	DRAGONQUEST HOLDINGS COMPANY, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLING POLAND – LUXEMBOURG BRANCH, as Guarantor
		
	By:	 	 /s/ Ian Foulis

		 	Name: Ian Foulis
		 	Title: Branch Manager
	
	VANTAGE HOLDINGS CYPRUS ODC LIMITED, as Guarantor
		
	By:	 	 /s/ Mark Howell

		 	Name: Mark Howell
		 	Title: Director
	
	VANTAGE DEEPWATER COMPANY, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DEEPWATER DRILLING INC., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to Second Supplemental Indenture] 

 
			
	TUNGSTEN EXPLORER COMPANY, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Tungsten
	
	VANTAGE DELAWARE HOLDINGS, LLC, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to Second Supplemental Indenture] 

 
			
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	 /s/ John C. Stohlmann

		 	Name: John C. Stohlmann
		 	Title: Vice President

  
 [Signature
Page to Second Supplemental Indenture]EX-4.2

 Exhibit 4.2 
 FIRST SUPPLEMENTAL INDENTURE 
 This FIRST
SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of May 22, 2013, among Vantage Driller VI Co. (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
March 28, 2013 providing for the issuance of 7.125% Senior Secured First Lien Notes due 2023 (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/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLING COMPANY, as Parent and as a Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER VI CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	PT. VANTAGE DRILLING COMPANY INDONESIA, as Guarantor
		
	By:	 	 /s/ David Tait

		 	Name: David Tait
		 	Title: Director

  
 [Signature
Page to First Supplemental Indenture] 

 
			
	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
	
	VANTAGE INTERNATIONAL MANAGEMENT CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	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/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to First Supplemental Indenture] 

 
			
	P2020 RIG CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Secretary
	
	VANTAGE DRILLER I CO, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER II CO, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER III CO, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLER IV CO., as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to First Supplemental Indenture] 

 
			
	SAPPHIRE DRILLER COMPANY, as Guarantor
		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	 EMERALD DRILLER COMPANY,
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	 VANTAGE HOLDINGS MALAYSIA I CO.,
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	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

  
 [Signature
Page to First Supplemental Indenture] 

 
			
	 DRAGONQUEST HOLDINGS COMPANY,
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	VANTAGE DRILLING POLAND – LUXEMBOURG BRANCH, as Guarantor
		
	By:	 	 /s/ Ian Foulis

		 	Name: Ian Foulis
		 	Title: Branch Manager
	
	VANTAGE HOLDINGS CYPRUS ODC LIMITED, as Guarantor
		
	By:	 	 /s/ Mark Howell

		 	Name: Mark Howell
		 	Title: Director
	
	 VANTAGE DEEPWATER COMPANY, 
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President
	
	 VANTAGE DEEPWATER DRILLING INC., 
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to First Supplemental Indenture] 

 
			
	 TUNGSTEN EXPLORER COMPANY,
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Tungsten
	
	 VANTAGE DELAWARE HOLDINGS, LLC, 
 as Guarantor

		
	By:	 	 /s/ Christopher DeClaire

		 	Name: Christopher DeClaire
		 	Title: Vice President

  
 [Signature
Page to First Supplemental Indenture] 

 
			
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	 /s/ John C. Stohlmann

		 	Name: John C. Stohlmann
		 	Title: Vice President

  
 [Signature
Page to First Supplemental Indenture]

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