Sydney Harbour, Garden Island, off Woolloomooloo Bay. 5 August 2013.
See Google Earth 33°51'46.58" S 151°13'36.59" E

Left : SPIRIT OF TASMANIA I ... IMO number : 9158446
Gross tonnage : 29338 ... Type of ship : Passenger/Ro-Ro Cargo Ship
Year of build : 1998 ... Flag : Australia
After departing Captain Cook Graving Dock.

Centre, in Captain Cook Graving Dock : PACIFIC JEWEL ... IMO number : 8521220
Gross tonnage : 70310 ... Type of ship : Passenger (Cruise) Ship
Year of build : 1990 ... Flag : United Kingdom (since 01/04/2007
Note height of caisson one hour later in http://www.shipspotting.com/gallery/photo.php?lid=1850529

Right : OCEAN SHIELD ... IMO number : 9628374
Gross tonnage : 8368 ... Type of ship : Offshore Support Vessel
Year of build : 2012 ... Flag : Australia (since 01-05-2012
The Australian Government purchased the Offshore Support Vessel Skandi Bergen to add to the Royal Australian Navy’s current amphibious ships, HMAS Choules and HMAS Tobruk, and subsequently announced that the Skandi Bergen would be renamed “Australian Defence Vessel Ocean Shield"