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Excellent. Interesting about them trying it in a submarine. From one of the links:
People from many parts of the world have found uses for these
natural lanterns. The Swedish historian Olaus Magnus wrote in 1652 that
people in the far north of Scandinavia would place pieces of rotten oak
bark at intervals when venturing into the forest. They could then find
their way back by following the light. Similarly, during World War I
soldiers in the trenches placed touchwood on their helmets to keep from
bumping into others in the dark. The Native American herbalist
Keewaydinoquay relates that an Ahnishinaubeg shaman of her acquaintance
positioned two glowing wooden pillars on either side of her doorway, much
as suburban homeowners arrange lights on a front lawn. These ghostly lights
scared visitors instead of attracting them, however, and the logs were soon.
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