Blindsight by Peter Watts, it's available for free [1] (CC-License on his website), he releases all his books like that, except for the most recent one, which is only available through publishers.
You can also download it on the site as epub or PDF.
Edit: Also, it's one of the few Sci-Fi books I know (all from Watts) that cites scientific literature and has a bibliography, to make an argument for plausability and give explanations in an afterword. Watts worked as a marine biologist before writing scifi, IIRC.
You can also download it on the site as epub or PDF.
Edit: Also, it's one of the few Sci-Fi books I know (all from Watts) that cites scientific literature and has a bibliography, to make an argument for plausability and give explanations in an afterword. Watts worked as a marine biologist before writing scifi, IIRC.
[1] https://www.rifters.com/real/Blindsight.htm