Aigul

 is a huge, stationary Lorn-Fluke upon which the vessel Fortas Kettle ran aground. Rather than attempt to extricate it, London turned the sunken vessel into an observation station also called Station VI. The crew have become... attached.

Location description
''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.''