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NTSB concluded investigation into partial sinking of tug

The National Transportation Safety Board (NTSB) has concluded its investigation into the partial sinking of the 'Uncle Blue' on the Lower Mississippi River near Ascension Parish, Louisiana, on March 26, 2023, and has discovered significant hull damage that led to the vessel’s flooding. The tug was transporting an empty barge when it began taking on water. During salvage operations, NTSB investigators observed water pouring from holes in the portside shell plating of the lazarette. The nearly 60-year-old vessel exhibited numerous wastage holes and doubler plates, indicating inadequate hull maintenance. NTSB investigators emphasized the importance of proper hull maintenance, stating. They recommended that vessel owners should crop out wasted steel on the hull and replace it by inserting new plating instead of covering it up with doubler plating. The investigation also revealed that pipe runs inside the hull, previously used for rod placement, were open on both ends and either corroded or missing in some areas. These openings allowed for progressive flooding into the voids and engine room. Highlighting the importance of proactive maintenance, Another contributing factor to the sinking was the absence of a high-water bilge sensor in the lazarette, which prevented early detection of flooding. The vessel’s only sensor was located in the forward end of the engine room. While no injuries or pollution were reported, the incident resulted in an estimated $500,000 in damage to the vessel. Full report: https://www.ntsb.gov/investigations/AccidentReports/Reports/MIR2423.pdf