Today I'm recommending BLAME! by Nihei Tsutomu.
Endlessly cool, ultraviolent to an extent, and broodingly dark, are some of the best ways I can describe this intense manga. Everything from head to toe about this manga is genuinely insane. I love this series as it follows our very silent protagonist as he explores a labyrinth filled with some survivors and even more things out to kill him and end his journey to find the Net Terminal Genes. Follow his journey and experience the bleak world he lives in.
I am once again highly recommending this series. I love this dystopic, cyberpunk, sci-fi, nightmare land, and the man who's willing to take it on headfirst.