Professional underwater diving services restore safe vessel operation
Reliable underwater diving services play a vital role in maintaining the operational efficiency and safety of commercial vessels. A recent underwater intervention aboard a commercial tug, demonstrates how experienced commercial divers can quickly resolve critical underwater obstructions and prevent costly downtime.
Following a request from the vessel’s managers, a specialized diving team was mobilized to inspect the port-side propeller after the crew reported an unknown object entangled around it. The operation was carried out over two days under favorable weather and visibility conditions.
Initial underwater inspection
Upon arrival, the diving supervisor and two commercial divers conducted a detailed underwater inspection, as part of our Ropeguard & Propeller Services, using proffesional diving equipment at an approximate draft of 3.0 meters.
The inspection revealed that the obstruction consisted of:
- An oil containment boom.
- A heavy steel chain attached to the boom.
- Multiple sections tightly wrapped around the propeller blades.
- A chain trapped beneath the rope guard surrounding the propeller shaft.
Initial diving status: Divers confirmed that the port-side propeller was heavily fouled by an oil boom and chain, significantly restricting safe propeller operation.
The entanglement required immediate removal to restore the vessel’s maneuverability and eliminate the risk of mechanical damage.
Specialized underwater diving services in action
Removing marine debris from propulsion systems often requires more than simply cutting away ropes or nets. In this case, the chain had become tightly wedged beneath the rope guard, making the operation considerably more challenging.
The underwater services team carefully:
- Removed the oil boom wrapped around the propeller blades.
- Cleared the chain from around the propeller shaft.
- Used a hydraulic underwater cutter to partially cut the rope guard.
- Released the chain trapped underneath the protective guard.
- Performed continuous inspections throughout the removal process.
The complexity of the work required precision, specialized equipment, and strict adherence to commercial diving safety procedures.
Heavy steel chains trapped beneath rope guards require controlled underwater cutting techniques to avoid damage to the propeller assembly and shaft.
Multi-day diving operation
Due to the late hour on the first day of operations, the diving team safely suspended the work and resumed the following morning.
The remaining sections of the chain were successfully extracted from beneath the rope guard, followed by a comprehensive underwater inspection to verify that no debris remained.
The diving status at completion confirmed that:
- All visible oil boom material had been removed.
- The attached chain was fully recovered.
- The propeller blades were freed from debris.
- The shaft and rope guard area were inspected.
- Photographic evidence documented the completed work.
Why underwater diving services are essential
Unexpected underwater entanglements can have serious operational consequences, including:
- Reduced propulsion efficiency.
- Increased fuel consumption.
- Damage to propellers, shafts, and bearings.
- Delays in port operations.
- Expensive dry-docking if the problem is not addressed quickly.
Professional underwater diving services allow vessels to remain afloat while qualified commercial divers perform inspections, debris removal, underwater cutting, and emergency repairs. This significantly reduces downtime and helps shipowners maintain safe and efficient operations.
Project summary
The successful removal of an oil boom and steel chain from a commercial vessel’s port-side propeller demonstrates the value of rapid underwater intervention by experienced commercial divers.
Working in favorable conditions with autonomous diving equipment, the team completed a technically demanding operation involving underwater inspection, debris removal, hydraulic cutting, and final photographic documentation.
Final diving status: Port-side propeller cleared of all debris, oil boom and chain completely removed, underwater inspection completed, and the propulsion system restored to normal operating condition.
This project highlights how professional underwater diving services help vessel operators minimize downtime, protect critical propulsion equipment, and maintain safe, uninterrupted maritime operations.
