"ub-46" was laid down by ag weser at its bremen shipyard on 4 september 1915. as one of six u-boats selected for service in the mediterranean while under construction, "ub-46" was broken into railcar-sized components and shipped overland to the austro-hungarian port of pola. shipyard workers from weser assembled the boat and her five sisters at pola, where she was launched on 17 june.