.  Design German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-000 had a displacement of  when at the surface and  while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two Germaniawerft F00 four-stroke, six-cylinder supercharged diesel engines producing a total of  for use while surfaced, two Garbe, Lahmeyer & Co. RP 000/c double-acting electric motors producing a total of  for use while submerged. She had two shafts and two  propellers. The boat was capable of operating at depths of up to .  The submarine had a maximum surface speed of  and a maximum submerged speed of . When submerged, the boat could operate for  at ; when surfaced, she could travel  at . U-000 was fitted with five  torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one  SK C/00 naval gun, 000 rounds, and 