Tartarus has all of the elements that really embrace the Sci-Fi Horror aspect which Ashen Stars is so well suited for. With elements of Alien, Dead Space, Prometheus, and Blade Runner it has a wonderful level of building tension and horror.
Also, it has a nice "Alistair Reynolds" Sci Fi feel to it.
Best adventure for AS yet. Nicely done.
(P.S. Space Suit Integrity is IMPORTANT. Pass it on.)