The tugboat SL Sual 1 sank off the coast of Zambales in the Philippines on August 24 during an attempted salvage operation, forcing all 10 people onboard to jump into the sea.
The vessel had previously been intentionally grounded near the Bucao River in Botolan on August 14 after seawater entered through a breach in its hull and flooded the engine room. Grounding the tug was intended to prevent it from sinking completely while salvage preparations were made.
A second tug was later dispatched to help refloat and tow SL Sual 1 away from the shoreline.
At approximately 07:46 local time on August 24, the towing operation was underway when the vessel began developing a progressively worsening list to starboard.
According to the Philippine Coast Guard, authorities are investigating whether the tug may have struck submerged metal debris or part of a previously sunken vessel during the operation.
Strong waves and rough sea conditions may also have contributed to the vessel's loss of stability.
As the list increased, it became clear that SL Sual 1 was going to sink. All 10 personnel onboard abandoned the tug by jumping into the water before the vessel became completely submerged.
The Philippine Coast Guard successfully rescued everyone involved, and all 10 people were reported to be in good condition.
The tug eventually sank in approximately 24 meters of water.
15,000 Liters of Diesel Onboard
Environmental concerns remain because SL Sual 1 was carrying approximately 15,000 liters of diesel when it sank.
The Philippine Coast Guard reported that the vessel's fuel tank remained intact, and no major pollution had been detected immediately after the incident.
However, shoreline patrols were deployed around the Bucao River and the sinking site to monitor for any signs of an oil spill.
Oil-spill response equipment, including absorbent materials, has also been placed on standby in case petroleum products are detected in the surrounding waters.
Investigation Underway
Authorities have begun investigating the exact sequence of events that caused SL Sual 1 to capsize during the salvage operation.
Investigators are examining several possible factors, including contact with submerged debris, the vessel's previous hull damage, strong waves and stability problems during towing.
The Philippine Coast Guard is also coordinating with the vessel operator, master and other parties to determine what should happen next with the sunken tug and the diesel remaining onboard.
Despite the rapid sinking, the successful evacuation and rescue of all 10 people prevented the incident from becoming a major maritime tragedy.
