Not much lives 1000m under the surface.
Under the surface (for example, below the European continent) or in the deep seas? I'm not sure about the former but I'm quite confident that the following applies to the latter:
My layman impression is that investigating lower altitudes becomes increasingly (perhaps exponentially) difficult the lower you go. Wikipedia also says that "Humans have explored less than 2% of the ocean floor" so I would disagree with your assessment of "not much lives 1000m under the surface".
I'm honestly interested in how you came to that conclusion though - If you have an interesting and reputable text that refutes me, please share. I came to mine based on reading Wikipedia too much.
I should have said "not much lives below 1000m until you get to the ocean floor". Not much can happen in the deep ocean because light doesn't penetrate that deeply. The creatures that do live there have to rely on organic material falling slowly from the surface.
The [Bathypelagic Zone] is also marked by very low temperatures (5 or 6 degrees Celsius) and having a very low organismal biomass, a trend that will continue until reaching the ocean floor.
From this article
This thread is intended to provide a space for 'crazy' ideas. Ideas that spontaneously come to mind (and feel great), ideas you long wanted to tell but never found the place and time for and also for ideas you think should be obvious and simple - but nobody ever mentions them.
Rules for this thread: