Its real, they used a red light at night to allow there eyes to get adjusted to the darkness in case they had to go topside or when running on the surface at night.
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It denos't mtater waht oredr the ltteers in a wrod are, it's olny iprmoatnt taht the frist and lsat ltteer be at the rghit pclae.The rset can be a total mses and you can sitll raed it wouthit porbelms.Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. 
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