The average human adult contains 10 trillion human cells but has 100 trillion microbes on their skin, hair, and mouth and in their intestines. Microbes protect us from harmful bacteria, help us digest food, even help change our mood. Microbes are also found in the sediments up to 1.5 miles below the seafloor, invisible to the naked eye and most ordinary microscopes, where they play an important role in the underwater ecosystem. Delaware Sea Grant (DESG), in partnership with the National Science Foundation-funded Center for Dark Energy Biosphere Investigations (C-DEBI), has expanded its collection of 15 Second Science videos to include longer Dive Deeper videos and virtual reality tours that explore the deep biosphere and sub-seafloor life. The full collection of 15 Second Science episodes focused on the deep biosphere and sub-surface life is available at www.deseagrant.org/ProjectVideo.