Construction of the hull, superstructure, and all major steel fabrication was carried out in Poland and the vessel towed to Holland for completion. Much of the fitting out was undertaken in the covered workshops at Gorinchem because the vessel was too large for the Hardinxveld facility.

The hull is 26.0m in length overall with a beam of 11.5m and virtually rectangular in planform, with heavily radiused and fendered corners. The bottom plating is reinforced to enable the vessel to take the ground without damage and at the bow is rounded to improve waterflow and seakeeping characteristics. Three shallow tunnels are formed at the stern to accommodate the triple screw propulsion nozzles, shafts and rudders. This configuration has enabled the draft to be reduced to a minimum of 1.75m and maximum of 2.20m, dependent on ballast and loading.

The deck has been given a rise of 40cm from aft to forward to improve performance at sea and increase buoyancy. Other hull features include two 600mm diameter 'Spud' holes, one forward and one aft, and a 1000m diameter 'Moonpool'.

Four heavily built 'push knees' have been built into the bow in a configuration designed to meet the owners particular needs.

The 6m wide bow roller is offset to starboard, has a diameter of 1.2m and a safe working load of 150 tonnes. Bulwarks have been kept to a minimum and guard rails are used around the stern to prevent fouling during towing operation. Deck space has been kept as free from obstructions as possible, with the working areas protected by hardwood sheathing.

The superstructure aboard Zwerver II has been carefully configured to encroach as little as possible on the work deck and is located hard over to the portside.

A well-glazed wheelhouse has a slight overhang to starboard offering a good view of the work deck and winches. Two single drum Ridderinkhof winches are installed, both on the vessel's centreline. The towing winch has a line pull of 30 tonnes and has been positioned as close as practicable to amid-ships.

Situated adjacent to the towing winch is a Mampaey quick release tow hook of 30 tonnes SWL. A 500m steel wire towline of 36mm diameter is provided.

A larger winch, designed for anchor-handling has a line pull of 80 tonnes and carries a 100m of 50mm diameter steel wire rope.

Both winches can be controlled remotely from the wheelhouse.

An important feature of this new vessel is the provision of two hydraulic deck cranes.

An Effer 160000/3sl capable of lifting up to 13.5 tonnes at a radius of 11.5m is mounted on the port bow. To cover the afterdeck is an Effer 80000/sl crane fitted on a mounting adjoining the towing winch fairlead. This crane is equipped with a winch and hoist wire and has a maximum lifting capacity of 6.2 tonnes at 11.6m radius.

To propel this triple screw vessel Damen have fitted three Cummins KTA-19M3 main engines producing a total of 2300 bhp. Power is transmitted via Reintjes WAF 364L gearboxes, with a 4.92:1 reduction, to fixed pitch Promarin propellers of 1550mm diameter. The propellers rotate within fixed 'Hodi-S' nozzles from Van Voorden Gieterijn. The steering system utilises three rudders and handling is improved considerably by the installation of a fully steerable, gill type, bowthruster. The latter is hydraulically driven and rated at 325hp and was supplied by Gerlien van Tiem. On trials Zwerver II achieved a bollard pull of 28.2 tonnes ahead and 19.3 tonnes when pulling astern, and a maximum speed of 10.7 knots.

Also accommodated in the spacious engineroom are two Cummins 6 BT5.9G2 generator sets of 98kVA. One set is fully silenced and both deliver 220/380v at 50 cycles. An additional Cummins N14 M 400kW auxiliary diesel powers the deck hydraulic system.

Pumping arrangements are installed to enable the rapid transfer of fuel and fresh water, at 75cu/m per hour, through separate hose reels mounted on the superstructure above the working deck. Integral tanks can accommodate 140cu/m of fuel oil, 60cu/m of fresh water and 90 cu/m of ballast.

The wheelhouse affords excellent all round vision and is well laid out for both navigation underway and working on site.

A relatively high view-point is a particularly useful feature when Zwerver II is carrying out pushing operations. A comprehensive bridge electronics package installed by Radio Holland includes two Furuno radars, an FR 1505 ARPA set and an FR 1505 Mk III. Also from Furuno is a SC-120 Satellite compass, a GPS 80 and GR 800 D-receiver, and a FE-700 echosounder. The magnetic compass is an Observator Mk IV and the autopilot is a Sea Pilot 75. A chartplotter and display is configured with Tsunamis 99 Offshore software and radio communication is via two Sailor RT 4822 radios.

Comfortable, air-conditioned, accommodation is provided for up to five persons in three cabins located below deck in the forward part of the vessel.

The usual domestic facilities include a mess room, galley and sanitary spaces.

Zwerver II left Holland immediately after completing trials and delivery formalities to work with Stemat in Le Havre.

The vessel is reported to be working well and likely to be under contract in the French port for at least one year.