Document:

EX-4.1

 Exhibit 4.1 

THIRD SUPPLEMENTAL INDENTURE 

This THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) is dated as of
October 15, 2013, among Vantage Driller ROCO S.R.L. and Vantage Drilling Gabon (the “Guaranteeing Subsidiaries”), subsidiaries 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 Subsidiaries shall execute and deliver to the Trustee a
supplemental indenture pursuant to which the Guaranteeing Subsidiaries 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 Subsidiaries 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 Subsidiaries hereby agree to
provide unconditional Note Guarantees 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. 

  
 1 

 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 Subsidiaries 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:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	 VANTAGE DRILLING COMPANY,

as Parent and as a Guarantor

		
	By:	 	 /s/ Douglas G. Smith

	Name:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	VANTAGE DRILLER ROCO S.R.L., as Guarantor
		
	By:	 	 /s/ Ronald J. Nelson

	Name:	 	Ronald J. Nelson
	Title:	 	Director
	
	VANTAGE DRILLING GABON, as Guarantor
		
	By:	 	 /s/ Douglas G. Smith

	Name:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	VANTAGE DRILLER VI CO., as Guarantor
		
	By:	 	 /s/ Douglas G. Smith

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

  
 [Signature Page to Third
Supplemental Indenture] 

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

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

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

  
 [Signature Page to Third
Supplemental Indenture] 

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

	Name:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	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 DRILLING NETHERLANDS BV,

as Guarantor

		
	By:	 	 /s/ Linda Jovana Ibrahim

	Name:	 	Linda Jovana Ibrahim
	Title:	 	Managing Director A
		
		 	 /s/ Joost Marcel van der Eerden

	Name:	 	Joost Marcel van der Eerden
	Title:	 	Managing Director B

  
 [Signature Page to Third
Supplemental Indenture] 

 
			
	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
	
	 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 J. Nelson

	Name:	 	Ronald J. Nelson
	Title:	 	Director

  
 [Signature Page to Third
Supplemental Indenture] 

 
			
	 VANTAGE DRILLING LABUAN I LTD.,

as Guarantor

		
	By:	 	 /s/ Ronald J. Nelson

	Name:	 	Ronald J. 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
	
	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

  
 [Signature Page to Third
Supplemental Indenture] 

 
			
	 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 Third
Supplemental Indenture] 

 
			
	 WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee

		
	By:	 	 /s/ Patrick T. Giordano

	Name:	 	Patrick T. Giordano
	Title:	 	Vice President

  
 [Signature Page to Third
Supplemental Indenture]EX-4.2

 Exhibit 4.2 

SECOND SUPPLEMENTAL INDENTURE 

This SECOND SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of
October 15, 2013, among Vantage Driller ROCO S.R.L. and Vantage Drilling Gabon (the “Guaranteeing Subsidiaries”), 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 Subsidiaries shall execute and deliver to the Trustee a
supplemental indenture pursuant to which the Guaranteeing Subsidiaries 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 Subsidiaries 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 Subsidiaries hereby agree to
provide unconditional Note Guarantees 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. 

  
 1 

 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 Subsidiaries 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:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	 VANTAGE DRILLING COMPANY,

as Parent and as a Guarantor

		
	By:	 	 /s/ Douglas G. Smith

	Name:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	VANTAGE DRILLER ROCO S.R.L., as Guarantor
		
	By:	 	 /s/ Ronald J. Nelson

	Name:	 	Ronald J. Nelson
	Title:	 	Director
	
	VANTAGE DRILLING GABON, as Guarantor
		
	By:	 	 /s/ Douglas G. Smith

	Name:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	VANTAGE DRILLER VI CO., as Guarantor
		
	By:	 	 /s/ Douglas G. Smith

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

  
 [Signature Page to Second
Supplemental Indenture] 

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

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

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

  
 [Signature Page to Second
Supplemental Indenture] 

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

	Name:	 	Douglas G. Smith
	Title:	 	Chief Financial Officer and Treasurer
	
	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 DRILLING NETHERLANDS BV,

as Guarantor

		
	By:	 	 /s/ Linda Jovana Ibrahim

	Name:	 	Linda Jovana Ibrahim
	Title:	 	Managing Director A
		
		 	 /s/ Joost Marcel van der Eerden

	Name:	 	Joost Marcel van der Eerden
	Title:	 	Managing Director B

  
 [Signature Page to Second
Supplemental Indenture] 

 
			
	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
	
	 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 J. Nelson

	Name:	 	Ronald J. Nelson
	Title:	 	Director

  
 [Signature Page to Second
Supplemental Indenture] 

 
			
	 VANTAGE DRILLING LABUAN I LTD.,

as Guarantor

		
	By:	 	 /s/ Ronald J. Nelson

	Name:	 	Ronald J. 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
	
	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

  
 [Signature Page to Second
Supplemental Indenture] 

 
			
	 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 Second
Supplemental Indenture] 

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

	Name:	 	Patrick T. Giordano
	Title:	 	Vice President

  
 [Signature Page to Second
Supplemental Indenture]

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