"ub-46" was ordered in july 1915 and was laid down at the ag weser shipyard in bremen in september. "ub-46" was a little more than in length and displaced between , depending on whether surfaced or submerged. she was equipped to carry a complement of four torpedoes for her two bow torpedo tubes and had an deck gun. as part of a group of six submarines selected for mediterranean service, "ub-46" was broken into railcar sized components and shipped to pola where she was assembled and launched in may 1916, and commissioned in june.