Summary:

- The deep ocean, which covers more than 90% of the Earth's habitable space, remains largely unexplored and unknown to scientists.
- A new study estimates that only 0.001% of the deep ocean has been observed, leaving 99.999% of this vast and mysterious environment unseen by humans.
- The deep ocean is home to a diverse array of marine life, including bioluminescent creatures, bizarre-looking fish, and potentially undiscovered species, yet our understanding of this ecosystem is severely limited.