(Airdate: April 22, 2026) Imagine life in the very deep sea – eternal darkness, no plant photosynthesis to form the base of the food webs, water temperatures hovering around freezing, pressures 1000 times greater than at the surface. Yet complex and diverse ecosystems exist; weird and sometimes very large creatures float and swim; and around 80% of this world remains unexplored. Mysteries and unknowns. Join Nan Evans and her guest, oceanographer Chris Kelley, as they consider life in deep ocean. This is Part 1 of a 3-part series.