There has also been a long-standing bug of sorts associated with this that you may have been experiencing - it happened to me again last night, for the first time in a long time, and fortunately I wasn't being attacked at the time. When it happens to me, there is never any other apparent cause (i.e., engine room fully manned and green barred, been maneuvering by rudder without course plotted for a while just fine, no damage, etc.).
I have always been able to "fix" it (get the engines to start up) by clicking on the engine telegraph to set some reverse speed, then forward again - one or two times doing that and it's always fired up for me.
I haven't seen any posts about it for a while, but there were several over the past few months and I never did see any real explanation for it (personally, it seems to happen to me mostly after I've stopped my engines on the surface, which I don't do that often as compared to stopping the electric motors underwater for hydrophone checks - so I suspect maybe they modelled something like a re-cycle time required to restart diesel engines - doesn't seem too likely, but who knows) but the above "fix" seems to have worked for most folks.
Good luck and good hunting!
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