I agree completely with the mixing of types but we can look at an SAE bolt and tell what size it is just as easily as you can look at a metric one. And maybe it’s bad manufacturing or some other type of industry standard but I have had many more metric bolts with a different sized head for a given shaft size than with SAE, like an M12 with anywhere from 17mm to 19mm head.

Was there a detonator? Pretty sure the article says they are still unsure how it ignited.

Supposedly the glued on titanium is the same thing the US Army does for their small Submarines, though I’m sure they found some way to cheap out/fuck up.