German submarine UB 91 under repair at the Kaiserliche Werft, Kiel, Germany in 1918

A list dealing dated 28 June 1918 reported the status of work on the submarines expected on 30 June. Work started on 21 June. Planned completion unknown. Description of the work remaining work. Remarks replaced on 24 June.

Source

Bundesarchiv RM 3-11254.