German submarine U 152 under repair at the Kaiserliche Werft, Kiel, Germany in 1918

A list dealing dated 23 June 1918 reported the status of work on the submarines expected on 23 June. Work started on 26 April 1918. Planned completion on unknown. Description of the work overhaul. Remarks completion date changed due more work on battery then foreseen.

Source

Bundesarchiv RM 3-11254.