[Note 1] UB-26 was trapped in anti-submarine nets trailed by the Trombe and was scuttled in Le Havre harbour on 5 April 1916.

Roland Morillot was subsequently towed into Cherbourg, France by the French tug Centaure.

The submarine was powered by two Daimler six-cylinder diesel engines producing a total 270 metric horsepower (270 shp; 200 kW), two Siemens-Schuckert electric motors producing 280 metric horsepower (210 kW; 280 shp), and one propeller shaft.

When submerged, she could operate for 45 nautical miles (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 7,200 nautical miles (13,300 km; 8,300 mi) at 5 knots (9.3 km/h; 5.8 mph).

She had a complement of twenty-one crew members and two officers and a thirty-second dive time.