The US Coast Guard has finished its hearings on the failure of OceanGate's Titan Submersible, after 2 weeks we've heard from a lot of people who are familiar with the technology, the company, or the people involved. And for me the most interesting thing is the details from the NTSB who delivered some new images of the debris, along with microscopic analysis of some recovered pieces.
Everything I see points to the carbon fiber hull not being fabricated to the standards needed to ensure safe margins needed for sustained operation. Some decisions during fabrication may have made the material weaker than it could otherwise be, and there's now evidence in the history of the vehicle pointing to degradation over time.
All the data and documents are here, and we're still waiting for a full report from the NTSB who will no doubt go into way more detail in an attempt to understand what happened in a split second 2 miles under the ocean.