Class-Approved Diving, Hull Inspection & Underwater Repair
Sealion delivers specialized underwater inspection, maintenance, and repair services through highly trained commercial divers and advanced underwater technologies. Every operation is performed in strict accordance with the requirements of major international classification societies including Lloyd's Register, DNV, Bureau Veritas (BV), ClassNK, and ABS — giving vessel owners, surveyors, and port authorities complete confidence in every report we deliver.
Our certified dive teams have accumulated decades of operational experience in the Red Sea and Gulf region, executing complex underwater surveys, emergency repairs, and infrastructure maintenance projects for ports, refineries, shipping companies, and offshore facilities. Full CCTV and DVD footage accompanies every inspection, giving classification societies, sale and purchase surveyors, and dry-dock planners a complete and reliable record of underwater condition.
- Vessel hull inspection & class-approved surveys
- Underwater repair, welding & cutting by certified divers
- Hull cleaning, propeller polishing & sea chest cleaning
- Cathodic protection & corrosion control systems
- Oil, gas & subsea pipeline inspection
- Underwater search, recovery & salvage repairs
- Leak sealing & emergency marine response
- Berth, jetty & offshore structure maintenance
Hull Cleaning, Propeller Polishing & Underwater Repairs
Our expert divers use approved and patented hull surface cleaning machines globally recognized as the most effective means to recuperate vessel performance and service speed. Advanced cleaning techniques and equipment ensure that no damage is caused to even the most delicate anti-fouling systems, such as silicone and other soft-coated paints. Regular propeller polishing reduces surface roughness to a Rubert's comparator's scale A/B, ensuring maximum thrust, diminishing drag, and optimum hydro-efficiency — while also reducing stress on the propeller shaft and your vessel's engines.
For underwater repairs, Sealion is the recognized leader in welding hull cracks, patching or replacing steel plate sections (with cofferdam when required), securing cracks with underwater bolts, replacing wasted zinc anodes, sealing stern glands, blanking sea water inlets to allow internal repairs, and cropping and balancing damaged propellers — all without the cost or delay of dry docking, when class approval permits.
Frequently asked questions
Below are the questions vessel operators ask most often about our underwater services. For anything specific to your vessel's class requirements, our dive team leads are available to discuss your scope directly.
Our diving and in-water survey operations are approved by Lloyd's Register, DNV, Bureau Veritas (BV), ClassNK (Nippon Kaiji Kyokai), and ABS. We hold valid certificates of approval for in-water surveys on ships and mobile offshore units.
Yes. Our emergency response diving team is available 24/7. We have responded to critical underwater hull breaches, propeller damage, and emergency sealing operations at short notice across Aqaba, Basra, and UAE ports.
Regular hull cleaning and propeller polishing reduces surface roughness, restores vessel performance and service speed, diminishes hydrodynamic drag, optimizes propeller efficiency, and reduces fuel consumption — resulting in significant cost savings over time.
Yes. Every underwater inspection is documented with full photographic records, CCTV/DVD footage, and detailed technical reports covering hull condition, paint coating status, cathodic protection assessment, and all damage observations — produced in the exact format required by the relevant classification society.