Oasis by Jessica Marting
To get her life back together, Valenna Merchant has to leave Echo-7. When the chance to escape to a remote military base on Omega-Three-Omega via a housekeeping job emerges, she takes it.
But nothing on the base is as it seems, including the cyborg, Anders, kept in a giant water tank for research purposes. And when Valenna uncovers the real reason behind her job offer at the base, she realizes she has to escape or die trying.
And she’s taking Anders with her.