Marine civil and offshore construction contractor

Penta-Ocean Construction

Wartsila rendering of Penta-Ocean's Cassiopeia V cutter suction dredger underway with its cutter ladder at the bow

Wartsila (rendering)

Japan-headquartered construction group with a marine civil engineering heritage and current capabilities spanning dredging, reclamation, soil improvement, caissons, wharves, port structures, specialist marine plant, and offshore wind installation interfaces.

Directory record: maintained by organization type, active region, marine works role, and market relevance.

Directory focus

Marine civil and offshore construction contractor with 4 active regions

Use this profile to map likely counterparties, delivery responsibilities, and where marine civil and offshore construction contractor capacity may influence project access or competition.

Profile status Public Evidence reviewed 20 July 2026

Type

Marine civil and offshore construction contractor

Active regions

Asia Pacific, Middle East, Africa, Global

Marine works roles

Marine civil contractor, Dredging and reclamation contractor, Caisson and wharf contractor, Marine plant owner, Offshore installation joint-venture partner

Profile summary

Japan-headquartered construction group with a marine civil engineering heritage and current capabilities spanning dredging, reclamation, soil improvement, caissons, wharves, port structures, specialist marine plant, and offshore wind installation interfaces.

Related records 3

Directory profile status

This public profile is a maintained directory record, not an endorsement, ranking, procurement recommendation, partnership confirmation, or claim of current availability. The evidence-review date records when IMWO checked the profile's public sources; it is not an organization event date. Use the profile for market mapping and research, then carry out separate technical, legal, and commercial diligence.

Review publication method Open directory guide Submit a correction

Source basis

Penta-Ocean's current corporate data and history identify a Japanese construction group founded from marine civil engineering, while its technology and fleet pages document marine structures, dredging, reclamation, soil improvement, and specialist vessels. Its Tuas release confirms a joint-venture award with Hyundai Engineering & Construction and Boskalis for Phase 2 reclamation, wharf construction, dredging, soil improvement, and caissons. Its May 2026 Oga-Katagami-Akita release confirms the Sea Challenger charter through Japan Offshore Marine, the Penta-Ocean and DEME Offshore joint venture. The profile records those bounded contractor and vessel interfaces without attributing the entire projects to Penta-Ocean alone.

Sources used 6