It is currently unknown how the station is able to achieve this feat. Some of the more Puritanical members of the Ordo Xenos feel that this is the Emperor's will being manifested through the astropaths on station.
Where the truth actually lies is unknown, as the Deathwatch are too busy fighting off the Tyranids to offer up an explanation, and the Inquisition is hesitant to order a full-scale investigation into the watch station while it remains as one of the only means of contact with the Orpheus Salient.
- Deathwatch - The Achilus Assault (RPG), pg. 44