Eunsung O&C

What Eunsung O&C does

Eunsung O&C Co., Ltd. is a Seoul-based specialty civil engineering contractor founded in 1989, operating at the intersection of marine and onshore ground improvement and foundation construction. Its core service portfolio includes Deep Cement Mixing (DCM), Reverse Circulation Drilling (RCD), Marine Piling via Jack-Up Barges, Gravel Bedding, Cutter Soil Mixing (CSM), Sand Compaction Piles (SCP), Diaphragm Walls, and Large Diameter Bored Piles — methods applied to ports, bridges, immersed-tube tunnels, offshore wind farms, airports, LNG terminals, mining ports, and large industrial facilities including semiconductor fabs and nuclear plants. The company's technical foundation rests on a substantial owned fleet: five jack-up barges (SEP Phoenix, Sirius, DUBHE, Eunsung 750, Eunsung 800), four-plus DCM barges (ESC-50/51/61/62/71), and an extensive Bauer rotary-rig and trench-cutter inventory, with in-house capacity to design and build new specialized vessels — exemplified by the KUS-ISLAND gravel bedding system (built for the Busan–Geoje Fixed Link, achieving sub-25mm tolerance at 49m depth) and three new DCM barges constructed for the Hong Kong International Airport 3RS program.

The company makes money primarily through project-based B2B contracts awarded via competitive tender to project developers, main contractors, joint ventures, and government agencies; pricing is project-specific and not publicly disclosed. Customer segments are entirely enterprise or governmental and span semiconductors (Samsung Electronics Pyeongtaek and Hwaseong), entertainment/construction (Lotte World 2), airport infrastructure (Hong Kong Airport Authority 3RS), LNG energy (Chevron Gorgon), mining (Rio Tinto Cape Lambert), nuclear (Doosan Heavy Industry Yeongkwang), bridges (AMEC Incheon Bridge), offshore wind (Doosan Enerbility / Korea Offshore Wind Power), and ports (Saipem–Afcons JV Sohar, Hong Kong TCR). Geographic reach covers South Korea, Hong Kong, Taiwan, Australia, Kuwait, Oman, Madagascar, and Brazil across 35+ documented projects. Marketing is reputation-led rather than digital: a bilingual corporate website, ISO 9001 and OHSAS 18001 certifications, and a 35-year track record are the principal credibility assets. Distribution is direct enterprise field sales via tender participation and subcontractor positioning under Tier-1 EPC joint ventures such as Samsung C&T–BuildKing and Saipem–Afcons.

Name

Eunsung O&C

Legal name

Eunsung O&C Co., Ltd.

Website

https://sepbarge.com

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

11–50 employees

Short description

Eunsung O&C is a Seoul-based specialty civil engineering contractor (founded 1989) executing marine and onshore foundation and ground improvement works — including DCM, piling, gravel bedding, and bored piles — for ports, bridges, offshore wind, airports, and industrial facilities worldwide via project-based tenders.

Ownership category

akta.pro rank

Product category

Specialty Foundation & Marine Construction Services

NAICS

Heavy and Civil Engineering Construction (237), Other Heavy and Civil Engineering Construction (237990), Site Preparation Contractors (23891)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600), Construction - Special Trade Contractors (1700)

akta.pro primary industry

Subsea & Nearshore Civil Works (Trenching, Rock Placement, Mattressing) (IMAFAJAI)

akta.pro secondary industries

Marine & Offshore Wind BOP Construction (Foundations, Cables, Ports, Installation Support) (EUAMAFAI), Quay & Waterfront Civil Works (Piers, Quays, Seawalls, Dredging, Revetments) (IMAJALAF)

Keywords

• Marine foundation construction
• Ground improvement services
• Specialty civil engineering
• Offshore piling works
• Deep cement mixing

Headquarters

HQ city

Seoul

HQ country

South Korea

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Marine Foundation Construction Services: Project-based revenue from providing marine construction services including piling, drilling, DCM, gravel bedding, and marine structure work using specialized jack-up barges and vessels for offshore projects.
2. Land Foundation Construction Services: Revenue from onshore ground improvement and foundation construction including CSM, diaphragm walls, bored piles, and earth works for buildings, infrastructure, and industrial facilities.
3. Specialized Vessel Construction: Custom construction vessel building and modification services tailored to specific project requirements, including the recent construction of 3 new DCM barges for Hong Kong projects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Eunsung O&C is a specialty civil engineering contractor providing marine and onshore ground improvement and foundation construction services. The company delivers piling, drilling, deep cement mixing (DCM), cutter soil mixing (CSM), gravel bedding, diaphragm walls, sand compaction piles, and large-diameter bored pile works using its own fleet of purpose-built jack-up barges, DCM barges, and rotary drilling rigs. Projects are awarded through competitive tenders from infrastructure developers, EPC contractors, and government agencies across ports, bridges, airports, offshore wind farms, and large industrial facilities.

Product overview

Eunsung O&C is a construction company established in 1989 specializing in offshore and onshore ground improvement and foundation construction works. The company operates a fleet of specialized jack-up barges (SEP Phoenix, SEP Sirius, SEP DUBHE, SEP Eunsung 750, Eunsung 800) and DCM barges (ESC-61, ESC-62, ESC-71) for marine operations, complemented by extensive construction equipment including Bauer rotary drilling rigs (BG-55, BG-40), trench cutters (BC-40), hydraulic oscillators (VRM-3000, VRM-2500, VRM-2000), and CSM rigs. The company offers integrated marine services including Reverse Circulation Drilling, Marine Piling, Percussion Rotary Drilling, Gravel Bedding (KUS-ISLAND), Deep Cement Mixing, Sand Compaction Piles, and Rubble Mound Leveling. For onshore operations, they provide Cutter Soil Mixing, Diaphragm Walls, Large Diameter Bored Piles, and Earth Work services. The portfolio includes vessel KUS-ISLAND, purpose-built for gravel bedding of immersed tube tunnels, considered pinnacle technology in this field.

Differentiator

Problem solved

Functional benefit

Products and services

• Marine Piling by Jack-Up Barges Marine piling service delivered via jack-up barges with high-pressure water guide pipe for pile driving into hard rock beds, allowing multiple piling locations and accurate pile installation. Used by port, bridge, and offshore infrastructure projects.
• R.C.D (Reverse Circulation Drilling) Air-lift drilling service highly efficient for large diameters and depths, both onshore and offshore, using compressed air injection below water level to create differential pressure for transporting solids to the surface. Used for large-diameter pile and foundation drilling works.
• Marine P.R.D (Percussion Rotary Drill) Rotary-percussion drilling service combining grinding and hammering action for solid rock formations including gravel, deployed in marine piling and foundation works.
• Gravel Bedding (KUS-ISLAND) Precision gravel bedding service using the purpose-built KUS-ISLAND equipment for seabed depths up to 49 meters, performing dropping and leveling in one step with tolerance less than 25mm. Used in immersed tube tunnel and seabed foundation works.
• D.C.M (Deep Cement Mixing) Soil improvement service using cement paste injection into soft soil (clay, sand, organic soil) for foundation work, waterproofing, and earthwork. Workable water depth up to -34 meters with low sound and vibration; deployed via dedicated DCM barges (ESC-50/51/61/62/71).
• S.C.P (Sand Compaction Pile) Marine deposit strength improvement technique using sand-filled cylindrical bags installed in casing pipes for consolidation, used in port and seabed foundation works.
• R.M.L (Rubble Mound Leveling) Rubble mound leveling service using S.C.P vessel with steel tamper and vibrator, achieving 100–350 m²/day capacity at -50m water depth for seabed preparation.
• C.S.M (Cutter Soil Mixing) Deep foundation technique injecting binder material (cement) into the ground for stabilization and land reclamation, improving soil shear strength via in-situ mixing. Used for onshore ground improvement.
• Diaphragm Wall / Slurry Wall Construction of underground structural elements for retention systems and permanent foundation walls, excavated under bentonite slurry. Used for deep basements and large commercial/industrial sites.
• Bored Pile Large-diameter bored pile service using reverse circulation drilling (RCD) for higher building loads and economical pile cap construction, delivered with Bauer BG-series rigs. Used for high-rise, industrial, and infrastructure projects.
• Earth Work
• Marine Structure Work Construction of marine structures including jetty piling, offshore platforms, and ancillary works using jack-up barges, delivered to port, LNG, and offshore wind projects.

Quantifiable outcome

• Gravel bedding tolerance of less than 25mm achieved with KUS-ISLAND
• +2 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core and major.

• Doosan Enerbility (formerly Doosan Heavy Industries & Construction)coreStrategic or Co-development Partner · 1 December 2019Eunsung O&C provided piling and structure work for the Korean West-South Offshore Wind Farm Development Project in partnership with Doosan Enerbility.
• Samsung C&T – BuildKing Joint VenturecoreImplementation/ SI/ Consulting Partner · 1 January 2019Eunsung O&C provided DCM equipment and operations for the Tung Chung New Town Extension TCR Project under this joint venture.
• Samsung C&T – BuildKing Joint VenturecoreImplementation/ SI/ Consulting Partner · 1 September 2016Eunsung O&C worked as a specialty subcontractor for marine DCM and ground improvement works on the Hong Kong International Airport 3rd Runway System project under this joint venture.
• Saipem-Afcons Joint VenturemajorImplementation/ SI/ Consulting Partner · 1 March 2010Eunsung O&C provided piling services for the Sohar Port Expansion Project in Oman under the Saipem-Afcons Joint Venture.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Saipem: Italian energy and infrastructure EPC contractor with a strong marine construction division (Saipem-Afcons JV is a documented Eunsung counterparty). Competes on offshore piling, jetty, and LNG/marine infrastructure scopes similar to Eunsung's work at Sohar Port and Gorgon.
• DL E&C (formerly Daelim Industrial): Major Korean general contractor with civil, building, and plant divisions, including port, bridge, and marine construction. Comparable in project categories but operates as a broad incumbent EPC/general contractor rather than a specialist like Eunsung.
• Hyundai Engineering & Construction: Korea's largest general contractor, active across civil, marine, plant, and infrastructure works including offshore wind and reclamation. Competes with Eunsung on domestic tenders and frequently engages Eunsung-style specialists as subcontractors on mega-projects.

Direct peers

• Van Oord: Dutch marine contractor with major presence in offshore wind foundation installation, land reclamation, and dredging. Competes with Eunsung for the same offshore wind and port development tenders, with a much larger fleet and broader geographic reach.
• Penta-Ocean Construction: Tokyo-listed Japanese marine and civil engineering contractor with a strong track record in offshore wind foundation, port construction, and reclamation work across Asia. Closely comparable to Eunsung in scope (marine piling, DCM, ground improvement) and in client profile (governments, port authorities, energy developers), though at significantly larger scale.
• Soletanche Bachy: Vinci subsidiary and one of the world's largest geotechnical and foundation contractors. Directly comparable to Eunsung's onshore and offshore foundation scope (bored piles, diaphragm walls, ground improvement, marine works) and competes for many of the same large industrial and infrastructure projects.
• Jan De Nul Group: Belgian marine, civil, and offshore contractor active in dredging, land reclamation, and offshore wind/foundation installation. Directly comparable on international marine piling and ground improvement tenders and competes with Eunsung in the Asian offshore wind market.
• TOA Corporation: Japanese marine construction specialist with deep expertise in harbor works, reclamation, bridge foundations, and offshore wind. Operates its own fleet of specialized vessels and is one of the most direct international comparables to Eunsung's marine foundation and DCM service offering.
• Royal Boskalis Westminster: Dutch marine services group with leading positions in dredging, offshore energy (cable lay, wind foundation), and coastal defense. Comparable in marine civil and offshore wind scope, though considerably larger and more diversified than Eunsung.
• Bauer Group: German specialist foundation contractor and equipment manufacturer whose Bauer BG-series rigs and trench cutters (BG-55, BC-40) form a significant portion of Eunsung's own fleet. Closely comparable on ground improvement, diaphragm wall, and large-diameter bored pile work globally.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Eunsung O&C