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Originally Posted by Mad Mardigan
Not sure... but, would definitely make sense with the self-illuminating dials & such... especially if undergoing or having had undergone a depth charge that "popped" the bulbs in the room & no replacements, available to replace them... especially if that DC attack took place at just sunset or shortly thereafter.
Radium paint was used in watchmaking, it began around 1908 and carried on into the 1960s. So... watches made between these dates with glow in the dark functionality may be made with this material.
That's just, info I pulled up for watches with that type of paint.
Considering 1908, am fairly certain,  that the dials, gauges & such... likely had that sed for them, as well. 
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That would be interesting and quite cool at depth with the P Class when condensation forms on the instruments in the control room. Incidentally, it doesn't form on the helm instruments in the conning tower. Maybe that was an oversight.