Rintlekk escape pod
A Rintlekk escape pod was the only surviving piece of a Rintlekk ship that was shot down by UNIT over Wasdale Head, falling into the lake and being salvaged by Dorothy McShane. It was controlled by a semi-semtient Squidget. Dorothy referred to it as 'the Pod' until the Thirteenth Doctor identified it as a Rintlekk Emergency Escape Vessel.
History
Whilst she was on on a climbing holiday in the Lake District, Sanaul alerted Ace to a UFO that UNIT was tracking, sending two planes to shoot it down. It crashed in the lake under Wasdale Head.
Dorothy kept it in her workshop, trying to repair it but having no idea of how it worked, or who it was created by.