>>211742185>Clearly the issue here isn't with the sub designYes it is. They chose materials ideal for tensile loads in an application that required compressive loads. The ring for the hatch was also just epoxied onto the end of the tube in an open warehouse without any clean room equipment to prevent contamination and no thought was put into how to compress, clamp, or post-process the joint to meet the expected loads.
>and the inspection process between divesComposites also cannot be inspected for defects or delamination with ultrasound equipment so they can't develop any kind of framework for finding issues before they result in catastrophic failures. They had no inspection process between dives because they had no expertise in producing composites. Their tube had defects and delamination issues before they even finished it and went ahead with the project anyway.
Every decision they made and every process step they went through was poorly thought out, poorly planned, and they fired anyone that pointed out any of these glaring issues throughout the process.