Aigul

"The station is pinned to the surface of Aigul. Once it was a roving vessel, the Fortas Kettle, and floated freely from place to place. Now it is stuck on spines of fluke-rock."

Aigul is a huge, stationary lorn-fluke. When a British zubmarine was sunk by its spines, London turned the whole mess into Station VI. It seems this Fluke's needles contain memories and emotions.