Diving Business

Underwater Inspection

We undertake in-water survey required by classification societies and any other inspections requested by customers.

- Underwater Inspection in lieu of drydocking
- Pre-purchase inspection for ship’s sale
- Investigation on ship’s fouling condition
- Investigations of hull paint conditions (including film thickness measurements and paint sampling)

We have many years of experience and knowledge regarding the hull structures of various ships, and are able to quickly and accurately inspect the bottom of the ship and associated equipment for damage or abnormalities.

Underwater Cleaning

The fouling of the hull by marine growth increases the frictional resistance of the hull and causes the lowering of the ship speed and the deterioration of the fuel consumption rate. In addition, the fouling of the hull not only causes economic loss in operation, but also threatens the safety of navigation by causing operation in a dangerous operating area due to overload operation of the main engine. We has been researching the growth process and adhesion mechanism of marine growth and the characteristics of silicone paints and antifouling paints. Based on this research, we conduct underwater cleaning using own developed “AQUA SHAVER” (Large electrically driven cleaning machine) equipped with various special cleaning brushes. That makes us possible to conduct effective underwater cleaning and minimizes damage to the antifouling coating.

Propeller Polishing

We provides a propeller polishing service that can expect energy saving in ship operation. Underwater Propeller polishing is different from polishing on land because seawater acts as a lubricant. Therefore, unlike polishing on land, there are no metal surface cracks that occur during polishing, resulting in smoother surface roughness. Propeller polishing is finished in class A or class B (Top six classes A through F) grade of Rubert scale. It has been highly evaluated by many customers continuously for many years. Propeller polishing carried out simultaneously with underwater cleaning makes a positive effect in even more efficient energy savings.

Damage Repairs / Others

Our experienced divers will propose optimal repair methods to customers for damage to the bottom of the ship and associated equipment, such as cracks or breaks in the outer plating or bilge keel, or missing or bent propeller blades. We will carry out repair work quickly and reliably after consulting with all relevant parties.

Other repair works are:
- Sealing work on overboard pipe for replacing outboard valves
- Removal of fishing nets and ropes entangled in thrusters, propellers, stern tubes, and rope guards
- Installation / replacement of anti-corrosive anodes
- Replacement of sensors on the bottom (Doppler logs, etc.).
- Surveys and work in marine civil engineering works.

ROV

In recent years, there have been an increasing number of opportunities for ROVs to perform underwater work in place of human divers.
Diving work has many restrictions (water pressure, working time, water temperature, etc.), and in Japan, diving work can only be performed during the day.
ROVs do not have these restrictions and are limited to simple inspections, but they can work relatively safely as long as their batteries last.
We also respond to requests from remote locations, so we can also view the state of the hull and ocean at the site from the office, just like a diver would do a CCTV inspection.