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chemgear · 07-05-2023, 01:12 AM

https://www.newyorker.com/news/a-rep...ting-to-happen

On January 18, 2018, Lochridge studied each major component, and found several critical aspects to be defective or unproven. He drafted a detailed report, which has not previously been made public, and attached photographs of the elements of greatest concern. Glue was coming away from the seams of ballast bags, and mounting bolts threatened to rupture them; both sealing faces had errant plunge holes and O-ring grooves that deviated from standard design parameters. The exostructure and electrical pods used different metals, which could result in galvanic corrosion when exposed to seawater. The thruster cables posed “snagging hazards”; the iridium satellite beacon, to transmit the submersible’s position after surfacing, was attached with zip ties. The flooring was highly flammable; the interior vinyl wrapping emitted “highly toxic gasses upon ignition.”

To assess the carbon-fibre hull, Lochridge examined a small cross-section of material. He found that it had “very visible signs of delamination and porosity”—it seemed possible that, after repeated dives, it would come apart. He shone a light at the sample from behind, and photographed beams streaming through splits in the midsection in a disturbing, irregular pattern. The only safe way to dive, Lochridge concluded, was to first carry out a full scan of the hull.

07-05-2023, 01:12 AM	#876
chemgear Franchise Player Join Date: Feb 2010 Exp:	https://www.newyorker.com/news/a-rep...ting-to-happen On January 18, 2018, Lochridge studied each major component, and found several critical aspects to be defective or unproven. He drafted a detailed report, which has not previously been made public, and attached photographs of the elements of greatest concern. Glue was coming away from the seams of ballast bags, and mounting bolts threatened to rupture them; both sealing faces had errant plunge holes and O-ring grooves that deviated from standard design parameters. The exostructure and electrical pods used different metals, which could result in galvanic corrosion when exposed to seawater. The thruster cables posed “snagging hazards”; the iridium satellite beacon, to transmit the submersible’s position after surfacing, was attached with zip ties. The flooring was highly flammable; the interior vinyl wrapping emitted “highly toxic gasses upon ignition.” To assess the carbon-fibre hull, Lochridge examined a small cross-section of material. He found that it had “very visible signs of delamination and porosity”—it seemed possible that, after repeated dives, it would come apart. He shone a light at the sample from behind, and photographed beams streaming through splits in the midsection in a disturbing, irregular pattern. The only safe way to dive, Lochridge concluded, was to first carry out a full scan of the hull.