Like all Type UB III submarines, UB-107 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun.

The first recorded fate of UB-107 was noted as sunk by depth charge on 27 July 1918 by the Royal Navy trawler Calvia and destroyer Vanessa at position 54°23′N 00°24′E / 54.383°N 0.400°E / 54.383; 0.400.

[4] It has since been argued that the UB-107 was probably not present for the attack by Calvis and Vanessa as it was the only U-boat that could have been responsible for the sinking of steamers Chloris and John Rettig two and a half hours later at position 53°52′N 00°10′E / 53.867°N 0.167°E / 53.867; 0.167.

[1] The fate of UB-107 was the subject of an episode of the documentary television series Deep Sea Detectives: "Mystery U-Boat of WWI".

The documentary offered various scenarios for the sinking based on historical evidence and exploratory diving at the wreck site.