"Rig for Red" is normally a command used in the [submarine] Control Room. It is normally used when the boat is going to be surfacing or coming to Periscope Depth at night. The purpose is to give the lookouts and the officer designated to head to the bridge upon surfacing a chance for their eyes to adjust to darkness..."

https://www.answers.com/Q/What_does_it_mean_to_Rig_For_Red_and_what_is_is_used_for

"Used in submarines, to ensure all interior lighting is red and of low intensity so as to preserve night vision."

http://www.readyayeready.com/jackspeak/termview.php?id=1677