BOKA Topaz

Dimensions

106.6 m length × 22 m beam

Deadweight

5,337 t

Draft

7.3 m

Positioning

DP2; Kongsberg K-POS DP31

Saturation system

Dräger; 18 divers; 300 m

Diving bells

Two three-person bells, 5.7 m³ each

Hyperbaric evacuation

One 18-person lifeboat

Diving gas

20,240 m³ at 200 bar

Working deck

860 m²; 5–10 t/m²

Deck payload

About 2,000 t, subject to loading conditions

Main crane

Hydramarine AHC; 150 t at 10 m radius

Observation ROV

Seaeye Cougar; 200 m tether

ROV handling

Hydramec LARS rated 2,000 m

Accommodation

105 persons plus 18 divers in saturation

Main moonpool

7.2 × 7.2 m

Main engines

Four Wärtsilä 6L32B2; 11,520 kW total

Helideck

S92; 12.8 t; daylight operations

Vessel identifier review

BOKA Topaz · IMO 9382815 · MMSI 257058640

Position uses the explicit Position Report 00:27 UTC, not the separate Static Report at 00:28. A newer-looking MarineRadar coordinate lacked an observation time and was excluded.

P&I entered owner

Havila Subsea AS

The IMO-matched public entry places this company under Gard’s P&I Owners heading. This insurance role does not by itself establish registered or beneficial ownership.

Flag recorded by insurer

Norwegian International Ship Register (NIS)

Flag as shown in the undated insurer entry reviewed on 18 October 2026; this is not a flag-register extract.

Builder / delivery

Fosen Mekaniske Verksteder, Norway; delivered 2007.

Published flag / port

Norway; Fosnavåg

Fleet association

Boskalis DSV fleet; vessels may be owned or chartered.

Undated fleet page; this listing alone does not establish the registered owner.

Charter status at acquisition

Rever Topaz was chartered when Boskalis acquired Rever's subsea business.

Historical charter relationship; this release does not establish a current registered owner.

Published insurance entries · 2026–2027

Gard shows BBC, WRC and two MLC certificate categories covering 20 February 2026 to 20 February 2027.

The MLC categories are Standard A2.5.2 and A4.2.1 paragraph 1(b). These are the periods displayed by the insurer, not independently authenticated certificates or a guarantee that cover remains in force.

Published class notation

DNV: 1A1, DSV-SAT, DSV-SURFACE, DYNPOS-AUTR, HELDK-SH

Operator specification; not a current class-status or inspection certificate.

Hewett decommissioning

Da Vinci and Topaz completed 200 operational days together; diving at 24–44 m, umbilical flushing and infrastructure sealing.

The total applies to the pair, not each vessel. The report also describes riser work on Bravo and Charlie platforms; vessel-specific allocation is not given.

Southern North Sea decommissioning

Joint Topaz / Da Vinci campaign: diving, disconnections, wellhead and subsea-structure removal.

Undated project highlight; client and vessel-specific execution dates are not disclosed.