Dokai Marine Systems Ltd is a marine and engineering solution company headquartered in Kitakyushu, Japan. Started out as a harbor tug assistant service provider within nearby Dokai Bay in 1948, we now have grown into a firm which delivers a wide array of services related to harbor tug, oceanographic survey, marine salvage, submarine cable laying, towage and oil development.

Utilizing our professional expertise gained from seven decades of experience in the industry, the company aims at ensuring the steady development of core business lines, while diversifying itself with new fields of business - like renewable energy sector.

In line with our company slogans: "Safe, Swift And Solid Always" and "The Most Sincere Sincerity For Every Customer", we are always striving to improve our services through the optimization of work, human and nonhuman resources including the fleet. We take pride in meeting and exceeding the ever-rising needs of our valued clients in this ever-changing world !



Our new ocean tug “Kairi” (6,400BHP, built in 2011), went into service in October 2020.
Relocation of Headquarters

We are pleased to announce that we are relocating our Kitakyushu headquarters to the following address effective 8th June 2020.

  • New address
  • 3-9, Yamatemachi, Wakamatsu-ku, Kitakyushu-city, 808-0036, Japan
  • Our phone and fax numbers will remain unchanged.

We look forward to continuing to do business with you at our new headquarters.

Misaki, in Service. Our new tugboat “Misaki” was delivered in October 2017. She is equipped with two main engines, each provides 2,200bhp.