[5] The crane house is secured to the foundation using 1,100 bolts 82 mm (3.2 in) in diameter, each weighing more than 40 kg (88 lb), and held in place by nuts.

[9] The large port and starboard cranes were fabricated at Huisman's factory in Xiamen, China, and shipped in pieces to Singapore; the BigRoll RoRo ships Baffin (now BigLift Baffin) and Beaufort were used to ferry the crane houses, luffing frames, winch frames and booms along with other large pieces in 2018.

[6] These two large cranes are also equipped with an auxiliary hoist capable of lifting 2,500 t (2,800 short tons) at a radius between 33 and 60 metres (108 and 197 ft).

[13] Power for the ship is provided by 12 MAN 8L51/60DF[14] inline eight-cylinder four-stroke engines equipped with selective catalytic reduction (SCR) to achieve IMO Tier III emissions.

[16] The fuel capacity is 8,000 m3 (280,000 cu ft) of LNG, which allows Sleipnir to cross the Atlantic or remain on station for one month.

[5] A 12-point mooring system using Stevpris Mk-6 anchors, each weighing 12 t (13 short tons), and 1,750 m (5,740 ft) of wire rope is used to hold the ship's position during lifting operations.

In addition, there is a circular helipad near the berths, measuring 28 m (92 ft) in diameter, capable of holding 15.6 t (17.2 short tons), which is designed for an AgustaWestland EH101 or Sikorsky S-92.

[19] Although the concept of a crane vessel larger than SSCV Thialf was studied as early as 2008, market conditions precluded formal design work until 2011.

[5] GVA Consultants completed preliminary conceptual studies for a new crane vessel for Heerema in March 2013, and were awarded a basic design contract in February 2014.

[20] Heerema intended for the new crane vessel to provide lifting capacities in the segment between the largest SSCVs (such as SSCV Thialf and Saipem 7000, capable of lifting 14,000 t (15,000 short tons) using deck-mounted revolving cranes) and floatover lifters (such as Pioneering Spirit, capable of 48,000 t (53,000 short tons) with significantly less flexibility).

[1] NSCV was planned to be built at Phase II of Sembcorp's Tuas Boulevard Yard, in an offshore dock measuring 255 by 110 m (837 by 361 ft), and was scheduled for delivery at the end of 2018.

[26] The vessel was christened SSCV Sleipnir by Mrs. Maha Hatfield on May 24, 2019, and embarked on sea trials and crane load tests afterwards.

[32] Sleipnir is next contracted to install the production and living quarters platforms of the Tyra Future project for Maersk Oil.

[33] Other future contracts include Brae Bravo (jacket and topsides removal) and Hollandse Kust Zuid Alpha (HVAC platform installation).