Crucible

The Crucible is a spaceship used by Davros and the Daleks in (DW: "The Stolen Earth"). Human prisoners were taken for an unknown variety of testing during the Dalek invasion of Earth in 2009. (DW: Journey's End)

It should not be confused with the Cruciform which was mentioned by The Master in (DW: "The Sound of Drums").

Behind the Scenes
The Crucible may be the station made for the Shadow Proclamation.