Ecoeden (Sci-Fi)

You are a mercenary who has been contracted to seek out and investigate an ancient, alien derelict after the disappearance of a research and analysis team that was charged with salvaging anything useful from the vessel. On approach, your personal ship was fired upon by the derelict's automated defense system, forcing you to crash into what appears to be an impossibly large eco-system within it. After wandering for a while, you find a hatch leading down into what appears to be a laboratory.