Unfortunately with flights you can usually at least take a good guess at what went wrong. I think we’ll be lucky if they find (and retrieve) wreckage in this case

>It’s sad of course, but the early days of flight were also quite dangerous but they lead to rapid innovation and the stable industry of today.

And if you tried to take paid passengers on a homebuilt uncertified aircraft today you would go to jail. This isn't the early days. The challenger deep was reached over 60 years ago. We've been building submarines longer than airplanes. We know how to do this stuff safely. This was negligence.

Sure but at that time no one knew how to fly. Today we absolutely know how to build and test decent submersibles and there’s really no excuse for building a machine as untested as this one.

There's calculated risk and reckless risk. Sounds like this was the latter unfortunately.

But risk can be mitigated with proper engineering, testing, and manufacturing process control. These are all quite well understood just seemingly not well implemented by this company.