3Q21 Operating and Maintenance (O&M) Costs

Transocean Ltd. and Subsidiaries

Operating and Maintenance Costs and Operating Days by Asset Class

September 30, 2021

(in millions, except day counts)

					Operating and Maintenance Costs
		3Q21			2Q21			1Q21			4Q20			3Q20
Ultra-deepwater floaters	$	228	$	206	$	215	$	256	$	236
Harsh environment floaters		126			181			167			169			172
Other costs*		44			47			53			40			62
Total operating and maintenance costs	$	398		$	434		$	435		$	465		$	470

				Rig Operating Days
	2Q21		1Q21		4Q20			3Q20		2Q20
Ultra-deepwater floaters	1,247	1,183	1,163			1,295	1,494
Harsh environment floaters	550	667	610			747	813
Total operating days	1,797		1,849		1,773			2,042		2,307

Other costs:

• Includes all shorebase and common support costs such as onshore offices, yards, other direct costs including labor pools and equipment, and certain newbuild expenses prior to commencement of operations, and costs of assets held for sale.