There were a lot of issues with the design, which I found helpfully explained in this video. [1] A major concern was intentionally hiring fresh college graduate

There were a lot of issues with the design, which I found helpfully explained in this video. [1] A major concern was intentionally hiring fresh college graduate engineers without keeping older submarine veterans on staff as well. There were some good questions raised about their breathing system. Were they just continually releasing oxygen in to the cabin to compensate for CO2, thus leading to a potentially high oxygen environment where a fire would be a major issue? Did they have isolated breathing equipment in case of a fire? After a previous dive it was noted that the vehicle was hard to visually locate even after surfacing, but it did not have a position beacon onboard, nor was it painted orange to make it easier to see. Why did they fail to include these suggested measures? I think there was a fair bit of other concerns. I thought this video was informative and the kind of thing the HN crowd would appreciate, so take a look. [1] https://www.youtube.com/watch?v=4dka29FSZac https://www.youtube.com/watch?v=4dka29FSZac