The UT722 LX might be the ultimate iteration of the UT722, although after the two ships built for Havila were launched no further ships of the type have been constructed. This is even though they appear to be well equipped for deep water and complex mooring tasks. Because of the space taken up by the wire and rope storage they have slightly limited deck space, which might have made them less popular. 

Type:UT722 LX		Name: BOURBON SURF		Photos: VIC GIBSON
GENERAL		PROPULSION		DECK EQUIP
Length OA	88 m	Engines	4 x Bergen	Workdrum pull	400t
Breadth	18 m	BHP	20,800	Capacity 1	9650m x 76mm
DWT	3120 tonnes	kW	15290	Capacity 2
Deck area	560 m2	For'd Thruster	883 kW	Towdrum pull	400t
Fuel	1350 m3	Az Thruster	883 kW	Capacity 1	5570m x82mm
Pot water	500 m3	Aft Thrusters	2 x 883 kW	Capacity 2
Mud	560 m3	Bollard pull	220 tonnes	Sharks Jaw	2 x 750 tonnes
Brine	1680 m3	DPII	Yes	Cranes	2 x 10 tonnes
Dry bulk	10000 cuft	Joystick	Yes	Tank Cleaning	No
Year built	2003	Shipyard	Langsten slip	Berths	-
Previous names	Havila Surf - These ships were fitting out at the time of the Bourbon purchase.
Comments	These two ships are possibly the ultimate interaction of the UT722, and have not been repeated. In addition to main work and tow drums a secondary storage system is available with a claimed capacity of 1300m of 8" synthetic rope.