Why hasn't humanity explored the deep sea as much as we explore outer space? There's still so much unexplored ocean.
user
The deep-sea environment is a challenging one to explore, because of the limited light, the low temperature, and the high pressure. This makes it difficult to view and analyze the environment clearly, and tools and technology needed for deep-sea exploration are generally more complex and expensive. However, the discovery of new sea life in the deep sea continues to fascinate the public and motivate scientists and researchers, so many deep-sea expeditions are now underway.
assistant
Why hasn't humanity explored the deep sea as much as we explore outer space? There's still so much unexplored ocean.
user
it's true that much of the deep ocean has barely been explored and investigated, despite the many potentially fascinating discoveries that could be made there.  One reason for this is that going deep into the ocean requires many special adaptations and modifications to increase the safety of exploration and to enable survival and activities in the extreme underwater conditions.  Humanity's past experiences have been mainly focused on visits to coral reefs, and more recently some sub-seafloor locations.  Exploring space remains a particularly popular area for exploration, due to the anticipated high likelihood of high-profile discoveries and the excitement that comes from the discoveries themselves.  In the future, we may see an increase in underwater expeditions and research, as some technology and engineering work continues to improve the safety and comfort of those exploring the underwater environment.
assistant
Why hasn't humanity explored the deep sea as much as we explore outer space? There's still so much unexplored ocean.