In the Second World War, German U Boats became a threat to all Allied shipping. By using under utilised resources like the WRENS and other experienced Naval staff, a solution was developed.In the Second World War, German U Boats became a threat to all Allied shipping. By using under utilised resources like the WRENS and other experienced Naval staff, a solution was developed.In the Second World War, German U Boats became a threat to all Allied shipping. By using under utilised resources like the WRENS and other experienced Naval staff, a solution was developed.