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16 comments
Tube🍂Time replied to Tube🍂Time

found more pics. the O rings weren't properly designed, the one on the left sits too deep because the groove wasn't machined correctly. There's also a plunge hole (presumably to get the undercutting tool in) that is a serious weak point.

Tube🍂Time replied to Tube🍂Time

the end sections of the hull, after being machined down to length, left these pieces behind, which show evidence of delamination. on the right, they put a bright light behind it and you can see it all the way through. very bad!

Tube🍂Time replied to Tube🍂Time

the flooring material (they used HDPE, high density polyethylene) was definitely not flameproof. what if some of that messy wiring shorted out and set fire to the floor? just everything about this vehicle was shoddy.

Mathaetaes replied to Tube🍂Time

@tubetime I’ve seen disposable drug smuggling boats wash up on the coast that are more resilient than this.

yes, it's me, liza 🇵🇷 🦛 🦦 replied to Tube🍂Time

@tubetime am thisclose to a panic attack (no, am not joking) reading this. this was a death sentence from the very beginning.

when Walter Benjamin said that capitalism is a death cult, this is exactly what he meant.

locastan replied to Tube🍂Time

@tubetime "Fake it 'til you make it"-mentality when it comes to extreme conditions.

Daniele Pantaleo 🦥:verified: replied to Tube🍂Time

@tubetime summary of the report: this is what happens when you let billionaires/techbros design and/or build stuff that should keep lives secure and safe.

Jeff Haluska replied to Tube🍂Time

@tubetime Sheesh, this feels more like a movie prop than something intended to go to extreme ocean depths.

We've all done hacky things but not in such unforgivable environments with risk of life for....tourism.

Roy replied to Tube🍂Time

@tubetime You are doing an important service by posting all this information. Thank you!

Bornach replied to Tube🍂Time

@tubetime They were probably thinking when has a failed O-ring ever been the weak point that led to the catastrophic failure of a hugely expensive vehicle while carrying a civilian to an extreme environment where only a tiny few humans can afford to visit?

F4GRX Sébastien replied to Tube🍂Time

@tubetime this "conical" groove means the o-ring will expand in it under pressure and prevent it from being watertight enough, or is it just me?

Not only this requires a tool entry hole that adds a point of failure, but a simpler straight groove might have been much better for watertightness, right?

Who designed that? Looks like they didnt even do basic homework on this.

Tube🍂Time replied to F4GRX

@f4grx no this is the standard way to capture an O-ring. a square groove would allow it to fall out. the trick is to use the right parameters so it compresses the correct amount. and i'm pretty sure there's a clever trick to eke the tool into place without leaving a plunge hole.

Henning Paul DC4HP replied to Tube🍂Time

@tubetime @f4grx You usually use sticky grease to avoid having it falling out. That's at least how I know it.

Michael K Johnson replied to Tube🍂Time

@tubetime @f4grx The plunge hole shows that they did this as fourth axis mill work instead of lathe work, as far as I can tell. This should be lathe work, I think, for a better sealing surface. Lack of knowledge of design for manufacture and process selection seems to jive with the overall collection of 🤦 here, as far as I (just a hobby machinist) can tell. If I'm wrong, I'd love to learn!

Adam the Machinist had a potentially relevant video recently that was talking about undercuts including plunge holes, but not about mill vs. lathe work:

youtu.be/p4blQSdmb_k

@tubetime @f4grx The plunge hole shows that they did this as fourth axis mill work instead of lathe work, as far as I can tell. This should be lathe work, I think, for a better sealing surface. Lack of knowledge of design for manufacture and process selection seems to jive with the overall collection of 🤦 here, as far as I (just a hobby machinist) can tell. If I'm wrong, I'd love to learn!

RebelGeek99 replied to Tube🍂Time

@tubetime alright, time to load up the next billionaire and keep it going, no time to waste, chop chop ⌚

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