FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Tonnel David A   2. Issuer Name and Ticker or Trading Symbol Transocean Ltd. [RIG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP and Corporate Controller (Last) (First) (Middle) 4 GREENWAY PLAZA 3. Date of Earliest Transaction (Month/Day/Year) 02/08/2018 (Street) HOUSTON, TX 77046 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Registered Shares 02/08/2018   M   34,704 (3) A $ 0 82,348 D   Registered Shares 02/12/2018   F   9,831 (4) A $ 9.4 75,517 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Stock Options

$ 9.18

02/08/2018

A

62,970

(1)

02/07/2028

Registered Shares

62,970

$ 0

62,970

D

Deferred Units

$ 0

02/08/2018

A

31,279

(2)

(2)

Registered Shares

31,279

$ 0

31,279

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Tonnel David A 4 GREENWAY PLAZA HOUSTON, TX 77046			SVP and Corporate Controller

Signatures

/s/ Daniel Ro-Trock By Power of Attorney		02/12/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	On February 8, 2018, the reporting person was awarded 62,970 stock options which vest as follows: 20,990 on February 7, 2019; 20,990 on February 7, 2020; and 20,990 on February 7, 2021.
(2)	The Deferred Units were acquired on February 8, 2018, by the reporting person pursuant to the Issuer's long-term incentive plan, and vest as follows: 10,426 on March 1, 2019; 10,426 on March 1, 2020; and 10,427 on March 1, 2021.
(3)	Deferred Units awarded on February 13, 2015 vested on February 8, 2018 upon satisfaction of the applicable performance measures pursuant to the Issuer's 2015-2017 performance cycle.
(4)	Shares sold upon vesting to satisfy tax withholding obligations

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