system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What stops humans from fully studying the bottom of the ocean? Why does it seem like there is still much to be discovered? What prevents us?

Appreciate the knowledge! 😁
gpt
Pressure, temperature and light makes it a very tough zone to study. We can get a human in a tin can down there but not for long and it can be really dangerous. It means we can’t get out and collect samples by hand. 
Any organisms we drag up tend to die and change shape since their bodies are built for high pressure systems, not low. 
Organisms are extremely well spread out down there so even finding them can be purely luck. 


Sometimes we drop ‘laboratories’ which are basically robots we control from above. Down there they can record video and using arms can collect samples of plants and tiny organisms which might survive the journey back up.