Dimensions
113.57 m length × 22 m beam
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
VESSEL PROFILE · IMO 9187526
BOKA Polaris
Published capabilities, ownership records and history. Evidence stays attached to every fact.
Open interactive profile 5 sources · 26 evidence records
Published specifications
12 particularsSource dates describe the evidence, not current certification or operational availability. Operating roles may be historical. Reference-only screenshot figures and ratings are not used in this summary.
- Published operating roleCatalogue source
- Boskalis
- Build yearPublished source
- 1999
- Length overallPublished source
- 113.57 m
- Hyperbaric lifeboats (SPHL)Published source
- 1
- Main cranePublished source
- AHC; 150 t SWL at 12.5 m radius
- Deck areaPublished source
- 700 m²
Published catalogue figure. Open the profile for its evidence and qualifications.
Catalogue source ↗Publication undated · Reviewed 17 Oct 2026
Boskalis ↗Applies to May 1999 · Published Sept 2021 · Reviewed 17 Oct 2026
Length overall in September 2021 sheet.
Boskalis ↗Published Sept 2021 · Reviewed 18 Oct 2026
One 18-person SPHL evacuation chamber; configuration at publication.
Boskalis ↗Published Sept 2021 · Reviewed 18 Oct 2026
Offshore SWL. The same sheet separately gives 250 t at 13 m for port use.
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Approximate working deck area; not the approximately 1,500 t deck payload.
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Not sourced in this summary: Bell occupancy, Saturation system manufacturer.
Specification research notes
Existing sourced core fields retained. Historical September 2021 Boskalis sheet has exact IMO 9187526; old flag/MMSI in it are not used to change current identity.
Supporting capability records
17 recordsPublished design and equipment particulars are evidence of the source configuration, not a current certificate or availability guarantee.
Summer deadweight
Approximately 5,500 t
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Summer draft
6.75 m
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Positioning
DP3; Simrad SDP21
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Position references
Two HiPAP 502 systems, two taut wires, three DGPS
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Saturation system
18 divers; 300 m
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Diving bells
Two bells, 6 m³ each
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Hyperbaric evacuation
One 18-person lifeboat
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Surface diving
Two air stations; one DDC
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Diving gas
20,400 m³ storage; reclaim system
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Working deck
About 700 m²; 5 t/m²; about 1,500 t payload
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Offshore main crane
AHC; 150 t SWL at 12.5 m radius
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Port crane rating
250 t at 13 m radius, port use
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Accommodation
104 berths
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Diving moonpools
Two, each 4.68 × 4.68 m
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Main engines
Four Wärtsilä 9L26; 10,720 kW total
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Helideck
EC225; 11 t; D-value 19.5 m
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Ownership & identity
6 recordsRegistered owner, group owner, operator, manager and P&I entered owner are different roles. Each record retains the role and date stated by its source.
Vessel identity
- IMO number
- 9187526
- MMSI
- 232585000
Both identifiers are in the Boskalis equipment sheet. Current AIS listing retains BOKA POLARIS and this MMSI. Some AIS listings contain malformed IMO 918752600; never replace the validated seven-digit IMO with it. Seaway Osprey is a different vessel (IMO 8616568). Boskalis sheet validates seven-digit IMO 9187526 and MMSI 232585000. MyShipTracking appends two zeroes to its IMO, an invalid nine-digit value; the position is associated using the exact name, MMSI and MYKR6 callsign. This is not Seaway Osprey (IMO 8616568).
offshoredownloads.boskalis.com ↗Publication undated · Reviewed 17 Oct 2026
Vessel identifier review
BOKA Polaris · IMO 9187526 · MMSI 232585000
Boskalis sheet validates seven-digit IMO 9187526 and MMSI 232585000. MyShipTracking appends two zeroes to its IMO, an invalid nine-digit value; the position is associated using the exact name, MMSI and MYKR6 callsign. This is not Seaway Osprey (IMO 8616568).
offshoredownloads.boskalis.com ↗Publication undated · Reviewed 17 Oct 2026
Owner and flag listed by Lloyd’s Register
Boskalis Subsea North Star Ltd · United Kingdom flag
The public register labels this company “Owner”. It does not separately establish the beneficial owner, commercial operator or charterer. Snapshot reviewed 18 October 2026; publication date not stated.
Lloyd’s Register ↗Publication undated · Reviewed 18 Oct 2026
Construction
Built May 1999
Boskalis ↗Applies to May 1999 · Published Sept 2021 · Reviewed 17 Oct 2026
Published flag
British; official number 901941
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Fleet association
Boskalis DSV fleet; vessels may be owned or chartered.
Undated fleet page; this listing alone does not establish the registered owner.
Boskalis ↗Publication undated · Reviewed 17 Oct 2026
Rever acquisition
Boskalis's acquisition included fully owned Rever Polaris.
Group-level ownership statement at acquisition; current registered-owner entity remains unverified. Vessel subsequently appears as BOKA Polaris in the official sheet.
Boskalis ↗Applies to 5 Jan 2021 · Published 5 Jan 2021 · Reviewed 17 Oct 2026
Research coverage & limitations (1)
Current registered owner and ISM manager were not established from the reviewed operator publications.
Checked 17 Oct 2026
Inspection & class records
2 recordsThese are historical records within each source’s coverage. Missing records are not a clean bill of health, and class descriptions do not prove current certification.
Published class notation
Lloyd's Register: 100A1, DSV, LMC, UMS, DP(AAA), ShipRight(MPMS)
Operator specification; not a current class-status or inspection certificate.
Boskalis ↗Published Sept 2021 · Reviewed 17 Oct 2026
Lloyd’s Register class entry
Classed · Diving Support Vessel · register build date 1999-05
Exact-IMO match in the public Ships in Class search, reviewed 18 October 2026. This is the displayed register status, not a survey report, port-state inspection or assurance of operational readiness. Full ClassDirect records were not accessed.
Lloyd’s Register ↗Publication undated · Reviewed 18 Oct 2026
Research coverage & limitations (2)
No exact IMO match was returned by the USCG PSIX vessel search. This is a limited US dataset, not a worldwide inspection clearance.
Checked 17 Oct 2026
No current survey, statutory certificate or port-state inspection record was verified in these publications. The published class notation is historical evidence, not confirmation of current validity.
Checked 17 Oct 2026
Project history
1 recordVessel-specific events and contextual project records retain their dates and limitations. A regional contract award alone does not establish vessel employment.
Shell North Sea campaign
Completed an inspection, repair, maintenance and decommissioning campaign.
The report explicitly names BOKA Polaris and places the project in 2021. Individual fields and execution dates are not specified.
Boskalis ↗Applies to 2021 · Published 10 Mar 2022 · Reviewed 17 Oct 2026
Research coverage & limitations (1)
The Shell campaign is verified, but individual field names, exact work dates and a complete project history were not available in the reviewed publications.
Checked 17 Oct 2026