Cold Harbor

This is Cold Harbor, the name of the last room Gemma is set to visit on the testing floor.

Despite Ms. Cobel assuring innie Mark that Lumon will dispose of him and all of his co-workers once Cold Harbor is complete, he threatens to betray everyone if the next thing he sees after stepping outside isn't the office’s elevator doors opening.

It holds a letter congratulating Mark, instructing him to finish the 25th file, Cold Harbor, as Helly. bears witness.

But the gore turns out to be useful since entry to the Cold Harbor room requires a blood sample.

All he’s told is that he must complete Cold Harbor.