In service: 2004 - 2020
Owner: The Maersk Co.Ltd. (Maersk Supply Service A/S) - Douglas; in 2009 Maersk Supply Service UK Ltd. (Maersk Marine Services Ltd.) - Douglas
Built: Ordered December 2002; keel laid 23-06-2003; completed 08-04-2004
Shipyard: Volkswerft Stralsund GmbH - Stralsund
Construction number: 447
Dimensions: 90.30 x 79.00 x 24.20 x 9.50 x 6.50 m
Tonnage: 6,536 GRT; 4,597 dwt
Call signal: M.D.J.L.7.
Lloyds/IMO: 9254379
Machines: 4x four-stroke 9 cylinder Krup/Maschinenbau Kiel type 9M.32, 320x480 coupled in pairs on an adjustable propeller; 1 bow thruster; 1 retractable Azimuth as bow thruster; 2 rear transverse screws; 4 generators 3,250 kW/660 V/60 Hz; 2x four-stroke V12 cylinder Caterpillar type 3512.DITA, 170x190 each coupled to a generator 1,064 kW/450 V/60 Hz; four-stroke 6 cylinder Caterpillar type 3506.DITA coupled to the auxiliary devices; Moonpool is present under the towing winch
Power: 23,492 MOT; 17,280 kW
Speed: 17 knots
Drawbar pull: 270 tons
Purchased: New construction
Sold: On 02-07-2020 as KARADENIZ POWERSHIP ALI BEY to Karpowership Americas Co.Ltd. (Karmarine Karadeniz Denizcilik) - Monrovia

In november 2022 renamed SIENNA by Silverburn Shipping IOM Ltd. - Barbados