Contagion duology

After receiving a distress call from a drill team on a distant planet, a skeleton crew is sent into deep space to perform a standard search-and-rescue mission. When they arrive, they find the planet littered with the remains of the project--including its members' dead bodies. As they try to piece together what could have possibly decimated an entire project, they discover that some things are best left buried--and some monsters are only too ready...