I am trying to build a blog of a short novel about a near-future technology-based sci-fi about the future of conflict. It starts with the stealing of an [Israeli Dolphin-class submarine][1]. I thought about social engineering that would allow knowing what kind of wine would the submarine captain and poisoned it with potassium. Maybe doing it for the whole crew before they tell the hierarchy but I thought it might not be realistic.

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The other thing that comes to mind is deeply mundane--simple sabotage will do, if done cleverly [and sabotage of that scale is quite difficult]. Messing with the diesel engines and their exhaust and some of the warning systems would be the right way and the whole crew could probably get killed with carbon monoxide poisoning ala [Chinese Submarine #361][2].

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However, that sounds like a failure due to existing technologies. I wanted to base it on something that could happen with emerging technologies. So my question is: what emerging technologies could put at risk the engines and their exhaust of a diesel submarine?

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[1]: https://en.wikipedia.org/wiki/Dolphin-class_submarine

[2]: https://en.wikipedia.org/wiki/Chinese_submarine_361