Zeus Storage is a storage facility located at 1616 Pandora St., Gaithersberg, Maryland.
According to Deep Throat, this is the facility where the first DNA transplant, human-alien hybrid was created.
Mulder learns of this facility while trying to locate Dr. William Secare, a fugative on the run from the police. Here, Mulder finds several bodies in water tanks. The next day, he contacts Scully and has her come to the facility with him where they find it is now empty except for Deep Throat who tells them, "God only knows. Most likely they've been destroyed."
When Mulder presses Deep Throat to tell him who destroyed the bodies, Deep Throat replies, "There are limits to my knowledge, Mr. Mulder. Inside the intelligence community there are so called 'black organizations,' groups within groups, conducting covert activities unknown at the highest levels of power." (TXF: "The Erlenmeyer Flask")