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UB-31 Folkestone, Kent: Archaeological Report

Project 6552

By Paulo Croche

This report covers an Undesignated Site Assessment of the possible wreck site of UB-31, lost off Folkestone on 2nd May 1918. The work was carried out as part of the Heritage at Risk (HAR) contract for archaeological services in relation to marine designation.

  • The assessment of the site was undertaken as part of a two stage investigation. Stage one consisted of a geophysical survey and stage two consisted of a diver survey of the site
  • The geophysical survey aimed to locate the wreck and inform the diving investigation, whilst the diving investigation resulted in a video survey of the wreck site. The survey informed an assessment of the current state and condition of the submarine and the identification of prominent features. The assessment confirmed the identification of the wreck off Folkestone as an example of the German submarine type UB II and circumstantial evidence supports its identification as the U-boat UB-31
  • The site has been assessed against non-statutory criteria for scheduling and has not been recommended for designation. The boat was observed as being in good condition with the pressure hull complete abaft the conning tower but damaged by the explosion that sunk it forward of the deck gun. The two propellers are missing
  • Risk is assessed as low. Natural decay and corrosion are expected and constitute the main risks to the site
  • No management actions are recommended.

Wessex Archaeology carried out this project, which was commissioned before English Heritage and Historic England became two separate organisations. Thus where English Heritage is referenced in the report, these functions have been transferred to Historic England.


  • Summary
  • Introduction
  • Assessment aims and objectives
  • Methodology
  • Results
  • Discussion
  • Risk assessment
  • Assessment against the non-statutory criteria for scheduling
  • Recommendations
  • Archive
  • References
  • Appendices

Additional Information

  • Publication Status: Completed
  • Pages: 52


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