SM UB-68

{{Infobox ship image

|Ship image=

|Ship caption=

}}

{{Infobox ship career

|Ship country=German Empire

|Ship flag={{Shipboxflag|German Empire|naval}}

|Ship name=UB-68

|Ship ordered=20 May 1916{{sfn|Rössler|1979|p=27}}{{cite Uboat.net

|name=UB 68

|id=UB+68

|type=1sub

|access-date=30 August 2009

}}

|Ship builder=Friedrich Krupp Germaniawerft, Kiel

|Ship original cost=3,276,000 German Papiermark

|Ship yard number=286

|Ship laid down=

|Ship launched=4 July 1917{{sfn|Gröner|1991|pp=25-30}}

|Ship commissioned=5 October 1917{{sfn|Gröner|1991|pp=25-30}}

|Ship fate=Sunk 4 October 1918{{sfn|Gröner|1991|pp=25-30}}

}}

{{Infobox ship characteristics

|Hide header=

|Header caption={{sfn|Gröner|1991|pp=25-30}}

|Ship class=Type UB III submarine

|Ship displacement=*{{convert|513|t|LT|lk=on|abbr=on}} surfaced

• {{convert|647|t|LT|abbr=on}} submerged

|Ship length= {{convert|55.83|m|ftin|abbr=on}} (o/a)

|Ship beam={{convert|5.80|m|ft|0|abbr=on}}

|Ship draught={{convert|3.67|m|ftin|abbr=on}}

|Ship propulsion=*2 × propeller shaft

• 2 × MAN four-stroke 6-cylinder diesel engines, {{convert|809|kW|bhp|abbr=on|order=flip|lk=in}}
• 2 × Siemens-Schuckert electric motors, {{convert|580|kW|shp|order=flip|abbr=on|lk=in}}

|Ship speed=*{{convert|13.2|kn}} surfaced

• {{convert|7.6|kn}} submerged

|Ship range=*{{convert|9,090|nmi|abbr=on|lk=in}} at {{convert|6|kn}} surfaced

• {{convert|55|nmi|abbr=on}} at {{convert|4|kn}} submerged

|Ship test depth={{convert|50|m|ft|abbr=on}}

|Ship complement=3 officers, 31 men{{sfn|Gröner|1991|pp=25-30}}

|Ship armament=*5 × {{convert|50|cm|in|1|abbr=on}} torpedo tubes (4 bow, 1 stern)

• 10 torpedoes
• 1 × 8.8 cm SK L/30 naval gun

|Ship notes=30-second diving time

}}

{{Infobox service record

|is_ship=yes

|is_multi=yes

|partof=*Mittelmeer I Flotilla

• 8 January – 4 October 1918

|commanders=*Oblt.z.S. / Kptlt. Heino von Heimburg

• 5 October 1917 – 1 July 1918
• Oblt.z.S. Karl Dönitz
• 2 July – 4 October 1918

|operations=5 patrols

|victories=*5 merchant ships sunk
({{GRT|10,709}})

• 4 merchant ships damaged
  ({{GRT|23,788}})

}}