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Read more: https://hakaimagazine.com/features/secret-history-bioluminescence/
TIL during WW2 Japanese soldiers used bio-luminescent species of Ostracod as a source of light to read maps on the battlefield without giving away their position. When mixed with water, the dried shells of these Ostracods give off a cold blue light.
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The whole article is very interesting, and the part about their use by Japanese soldiers is present in the 2nd paragraph.
That is very inventive!