the.com/deep ocean
most of earth is a dark, cold, crushing basement we've mapped worse than the moon.
means the part of the ocean below about 200 meters, where sunlight dies and pressure, cold, and darkness run the show.
from from oceanographers dividing the sea by light penetration; below the sunlit epipelagic zone, greek-rooted zone names (mesopelagic, bathypelagic, abyssopelagic, hadalpelagic) stack downward like floors in a building nobody built elevators for.
map coverageless than 25 percent of seafloor precisely mapped
pressureat the bottom, over 1000 atmospheres of crush
volumeholds over 90 percent of earth's livable space
lightzero sunlight below roughly 1000 meters
for instance
mariana trench — deepest known point, nearly 11000 meters, pacific ocean
challenger deep — james cameron solo-dove it in 2012
midnight zone — bathypelagic layer, home to anglerfish and giant squid
hydrothermal vents — discovered 1977, life running on chemicals not sunlight