[guax]

I think you're under estimating the controller and over estimating your understanding of the conditions it would live on the vessel. Why it's non redundant? There were likely spares around, if it misbehaves you can get a new one in seconds.

[ansible]

> Why it's non redundant? There were likely spares around, if it misbehaves you can get a new one in seconds.

So you are saying they were carrying around a spare controller, and a spare everything else inside the sub? At all times?

[jacquesm]

They in fact did say somewhere that they carry 'a couple of spares'.