What kind of ship is Thialf?

Thialf is a crane vessel sailing under the flag of Panama, built in 1985 by Mitsui Engineering & Shipbuilding. The vessel is 201.6 m long with a beam of 88.4 m and has a gross tonnage of 136,709.

What sanctions and inspection records does Voydar hold for Thialf?

Voydar has no matched sanctions record displayed for Thialf from the OFAC SDN list, the UK Sanctions List, the Canadian autonomous sanctions list, the EU list of designated vessels and the New Zealand Russia Sanctions Register. Coverage may be incomplete; this is not sanctions clearance. Thialf has 2 recorded Port State Control inspections. Detention and deficiency detail is not recorded for these inspections.

Thialf

Crane vessel · Panama · built 1985 · AIS Class A

IMO8757740MMSI353979000Call sign3EAA4Last AIS position Oct 2, 2026, 04:14 UTC

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In short

Thialf (Crane vessel, Panama flag) was last seen on AIS on Oct 2, 2026, 04:14 UTC, moored, in the North Sea.

Vessel type: Crane vessel
Flag: Panama
Year built: 1985
Gross tonnage: 136,709
Size (length × beam): 202 m × 88 m
Registered owner: —

Last reported position

received Oct 2, 2026, 04:14 UTC

Position: 51.9242° N, 4.2129° E
Area: North Sea
StatusWhat do AIS statuses mean?: Moored
Speed: 0 kn
Course: 0°
Heading: 128°

51.9242° N, 4.2129° E

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Voydar detected no port call in the last 30 days.

Port calls are detected by Voydar from AIS (at least 30 minutes slow inside a harbour area); see Port calls below.

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Identity & particulars

Name: Thialf
IMO numberWhat is an IMO number?: 8757740
MMSIWhat is an MMSI?: 353979000
Call signWhat is a call sign?: 3EAA4
Flag: Panama
Vessel type: Crane vessel
AIS ship type: Other
Gross tonnageGross tonnage vs deadweight: 136,709
Length overall: 201.6 m
Beam: 88.4 m
Year built: 1985

A tag next to a value names the register that supplied it (hover or tap it for the record and date). Values without a tag come from the ship's own AIS broadcasts or from Wikidata. Position and identity are derived live from AIS.

Ownership & management

Each line shows where the fact comes from. Links backed by an identifier point to the company page.

Operator: Heerema Marine Contractors
Source: Wikidata · since 1997 · reported · confidence 0.8 · retrieved Sep 22, 2026
Builder: Mitsui Engineering & Shipbuilding
Source: Wikidata · reported · confidence 0.8 · retrieved Sep 22, 2026

Timeline

Dated events for this ship from every source Voydar holds, newest first. Each line names its source; derived items say how they were derived.

Date	Event	Source
May 28, 2025	Port State Control inspection at Woods Hole, Massachusetts	USCG PSIX / CGMIX inspections
Mar 12, 2009	Inspection at WASHINGTON, District of Columbia	USCG PSIX / CGMIX inspections

Owner, operator and manager changes found by comparing yearly EU MRV reports are dated to the reporting year ("during 2025"), not to a day. Port calls here are the most recent only; the full lists are further down.

Safety & inspections

Inspections

not recorded

Detentions

Deficiencies

Date	Type	Port	Findings
May 28, 2025	Vessel InspectionPSC	Woods Hole, Massachusetts	clean
Mar 12, 2009	Incident Investigation	WASHINGTON, District of Columbia	clean

Source: U.S. Coast Guard Port State Information Exchange (PSIX) — public domain. Covers inspections recorded in U.S. waters. Free on Voydar; the incumbents charge for this.

About Thialf

SSCV Thialf is a semi-submersible crane vessel operated by the Netherlands-based Heerema Marine Contractors; it was the largest crane vessel in the world until the SSCV Sleipnir became the largest in 2019.

Summary from Wikipedia, licensed CC BY-SA.

Frequently asked questions

Where is Thialf now?: Thialf (Crane vessel, Panama flag) was last seen on AIS on Oct 2, 2026, 04:14 UTC, moored, in the North Sea.
What kind of ship is Thialf?: Thialf is a crane vessel sailing under the flag of Panama, built in 1985 by Mitsui Engineering & Shipbuilding. The vessel is 201.6 m long with a beam of 88.4 m and has a gross tonnage of 136,709.
What sanctions and inspection records does Voydar hold for Thialf?: Voydar has no matched sanctions record displayed for Thialf from the OFAC SDN list, the UK Sanctions List, the Canadian autonomous sanctions list, the EU list of designated vessels and the New Zealand Russia Sanctions Register. Coverage may be incomplete; this is not sanctions clearance. Thialf has 2 recorded Port State Control inspections. Detention and deficiency detail is not recorded for these inspections.

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