translation.en: Now, this one is blue, and that's the color of most bioluminescence in the ocean because evolution has selected for the color that travels farthest through seawater in order to optimize communication.
translation.zh: 这个灯发蓝光， 蓝色也是深海生物性光最普遍的颜色。 优胜劣汰，适者生存， 蓝色是海水中传播最远的光束， 也借此来优化深海信息传播。