Owned Vessels & Equipment
Safely and reliably connecting.
We own a large number of vessels, including those equipped with advanced facilities, such as automatic vessel positioning equipment and the Dynamic Positioning System (DPS), capable of significantly improving work efficiency. We are prepared to undertake tasks in all Japanese waters as required. Crewless exploration and video filming using remotely operated vehicles (ROVs) are also possible.
We introduce the vessels and equipment that form the hardware foundation of SEKIKAIJI's Underwater Power.
Cable laying, burying, and transport barge services
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NEW CABLE LAYING BARGE New Ship: Scheduled to Debut in April 2026
・Non Self-Propelled DPS Work Barge
・It is a DPS work barge designed with the concept of accommodating the growing offshore wind power generation projects aimed at achieving a decarbonized society. This barge enables the installation of long and large-capacity submarine cables and is also designed with operations in shallow waters. One of the key features is that Turn Table for loading cables can accommodate up to 3,500 tons, making it one of the largest in Japan as of April 2026. -
Awaji A dedicated barge for laying submarine cables and water pipes.
Equipped with the DPS for stationary positioning and a standard turntable, capable of maintaining position even in deep waters or areas where anchor deployment is challenging.
“Awaji” can outfit specialized equipment for laying cables between wind turbines, with endorsed construction track records.
Also capable of diverse site responses beyond submarine lines. -
Asahi A barge for laying and burying submarine cables and water pipes.
Equipped with the DPS for stationary positioning and a standard turntable. The dedicated mothership for the large ROV, “Ditch Queen,” specialized in burial and investigation.
After laying cables, subsequent burial construction by the Ditch Queen is possible.
Like “Awaji,” it operates as a multipurpose DPS work barge. -
Ditch Queen An underwater robot (ROV) specialized in burial and investigation.
It descends into the water from its mothership “Asahi” and is connected by wire to the control room on board for remote operation.
After underwater installation, it can investigate the burial depth of cables using equipped sensors. -
Akari A transfer barge for cables and water pipes.
A barge equipped with a 700-ton turntable. (*Not equipped with the DPS)
Small Workboats & Transport Vessels
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Manta A small boat that is easy to use and can be transported by trailer.
When diving operations are required, it serves as the mother ship for divers and as an assist ship when barges are departing from the port, making it an indispensable vessel that is easy to use and tailored to the task at hand. It can be transported by trailer, allowing it to be active nationwide.
This small coastal vessel is capable of solo navigation to anywhere in the country (excluding some areas like Okinawa’s main island). -
Seki Maru No. 5 A small steel-made vessel that can be transported by trailer.
Mainly used as a mother ship for diving operations, equipped with a two-ton winding winch.
Land transportable by trailer. -
Seki Maru No. 8 Multi-functional in barge towing, anchor placement and retrieval, etc.
A 19-ton tugboat and workboat.
Equipped with a 10-ton winding winch, it also performs anchor placement and retrieval operations. -
Eshima 3 A small workboat and traffic ship that is highly maneuverable.
Serves as a traffic ship and support vessel during cable laying, transportable by a four-ton truck.
Available as a small workboat (diving workboat) in various sites. -
Eshima 5 A small workboat and traffic ship that is highly maneuverable.
Serves as a traffic ship and support vessel during cable laying, transportable by a four-ton truck.
Available as a small workboat (diving workboat) in various sites. -
Eshima 6 A small workboat and traffic ship that is highly maneuverable.
Serves as a traffic ship and support vessel during cable laying, transportable by a four-ton truck.
Available as a small workboat (diving workboat) in various sites. -
IkanaGo Available as a small workboat (diving workboat).
Mainly operates as a traffic ship.
Owned Equipment
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Small ROV (VEGA) Capable of video filming with an underwater exploration device.
The remotely operated vehicle (ROV) is connected to the ship by wire, allowing for remote-controlled underwater exploration and video filming from the ship.
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Small ROV (VEGA II) Capable of video filming with an underwater exploration device.
The remotely operated vehicle (ROV) is connected to the ship by wire, allowing for remote-controlled underwater exploration and video filming from the ship.
Equipped with a cable finder (AC sensor), enabling cable tracing operations. -
Small ROV (VEGA III) Capable of recording clear images with high-definition filming.
The remotely operated vehicle (ROV) is connected to the ship by wire, allowing for remote-controlled underwater exploration and video filming from the ship.
Equipped with a cable finder (AC sensor), enabling cable tracing operations. -
Towed burial machine Water jet burial machine
A towed water jet burial machine equipped with a sensor for burial machine attitude monitoring, burial depth gauge, and underwater monitoring camera.
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5t BCE 200model BOW CABLE ENGINE Bow cable loading device: Made in November 2023
The BCE is mainly used for handling submarine cables during loading operations (ship-to-shore, shore-to-ship, ship-to-ship, and shore relocation, etc.).
To operate it, the machine is lifted by a crane to the top of the coil/turntable, and the cable is moved by the machine's traction force.