This Ocean Explorer lesson plan (PDF) explores the questions: What colors, if any, are visible down in the deep sea? What is bioluminescence? Students will learn about white light (visible light), the quantity and quality of light as related to ocean depth, the difference in water penetration between red light and blue light, bioluminescent organisms, the color of most bioluminescent light, and why organisms bioluminesce. The lesson plan includes background information and keywords, a list of materials, teacher preparation instructions, learning procedures, related links, evaluation and extension ideas, and correlation to the national standards.