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The only manned submersible that could reach the missing Titan is owned by Steam's Gabe Newell
(wegotthiscovered.com)
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My thought is are they from different lots and are the batteries from different manufacturers and different lots? You don't want to have 5 devices and them all from the same batch and all fail in the same way. A company not concerned by safety probably wouldn't consider any of this. I also bet their SOP didn't include changing batteries every time, so you have to rule out that these spares probably weren't getting charged up or have their batteries replaced either.