german Imperial German Navy - Kaiserliche Marine (1903-1919) UB-115 [+1918]
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nationality german
purpose war
type submarine
subtype/class UB III class submarine (ger.)
UB III class submarine (ger.) UB-48 (+1918)
propulsion diesel and batteries
date built 1918
live live
weight (tons) 651  disp (subm)
dimensions 55.3 x 5.8 x 3.68 m
material steel
engine 2 x 6 cylinder 4 cycle diesel by Mann-Vulcan - 2 x 550 EHP, electric motors type Mafferi - 2 x 500 EHP, 2 x screw
armament 10 torpedoes, 4 bow 50cm/19.7” torpedo tubes, 1 stern 50cm/19.7” torpedo tube, 1 x 105mm KL/45 deck gun (160 rounds)
power 1100  h.p.
speed 13.6  knots
yard no. 321
about the loss
cause lost depth charge
other reasons air raid
date lost 29/09/1918  [dd/mm/yyyy]
casualties  max.39rank: 606
about people
Blohm & Voss, Hamburg
Imperial German Navy - Kaiserliche Marine (1903-1919)
captain Thomsen, Reinhold
complement 34
no. of crew 39
about the wreck
depth (m.) 53 max. / 49 min. (m)
orientation 106°
position on seabed upright
protected no
war grave
entered by Hudson Garry
entered 16/02/2004
last update Lettens Jan
last update 30/10/2009
Lettens Jan01/10/2009
latitudeUK hydro member
longitudeUK hydro member
AISUK hydro member
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dist. homeportdist. homeport
ref. used
 UK Hydrographic Office
position disp.
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  The Wreck today  

Lettens Jan01/10/2009

UK hydro member
ref. used
 UK Hydrographic Office

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copyright: Unknown - onbekend - inconnu
 copyright: Unknown - onbekend - inconnu copyright: UK Hydrographic Office copyright: Unknown - onbekend - inconnu copyright: Unknown - onbekend - inconnu 
 copyright: Unknown - onbekend - inconnu copyright: Lettens Jan copyright: Unknown - onbekend - inconnu copyright: Unknown - onbekend - inconnu 
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  Hydrographic Service UK  
Racey Carl04/10/2009Commissioned 28th May 1918; Served in the Flanders U-boat flotilla; UB-115 was the last U-boat to leave Zeebrugge to attack shipping at end of WW1; Sank by depth charges from the British destroyers OUSE & STAR along with six armed trawlers, and by bombs from the airship R29; All 39 crew lost.

2 x 3-bladed propeller, 1.40m diameter; Pressure hull length 40.10m, breadth 3.90m; 6 water tight compartments; Two hyroplanes forward & two aft: Two parallel rudders; 4 bow 50cm19.7” torpedo tubes, 1 stern 50cm/19.7” torpedo tube; 1 x 105mm KL/45 deck gun; Speed (knots) surface / submerged 13.3 / 7.5; Surface range @ 5 - 8 knots, 8,500 miles - 84 tons fuel oil; Submerged range 70 miles @ 3knots; Electric motors type Mafferi, 2 x 500 EHP; Two 62 mass-cell Afag batteries.
ref. used: 
 Racey Carl
Novocastrian1312/07/2011TM Convoy record in ADM 137/2643
Racey Carl04/10/2009

The UB-115 left Zeebrugge on 18th September 1918 for a patrol along the north east coast of England. On 29th September she was submerged 4½ miles off Newbiggin-by -the-Sea when at 1.29 p.m. the crew of the British airship R29 sighted an oil slick on the surface. The R29 was escorting a Scandinavian convoy at the time.The airship then dropped a 230-pound bomb to indicate the location. The British destroyer OUSE arrived on the scene but could not find the oil until the R29 dropped another bomb and a calcium flare. This time the OUSE, now joined by the STAR, found the spot and the two destroyers proceeded to drop seven depth charges at 50, 100 and 200 feet; three trawler joined the hunt and dropped ten more charges. Oil and air began to come up in considerable quantities, though the air bubbles were quite small. Evidently the U-boats hull was still fairly tight. At 2 p.m. she started her motors but soon stopped them again after the trawlers, listening with hydrophones, dropped twelve more charges. An hour later she tried again; two more depth charges brought up oil. At this point she was unable to reach the surface, for between 4 p.m. and 6.25 p.m. she ran her motors constantly in spite of the depth charges occasionally dropped. Oil came up all night, and two days later sweepers located an obstruction from which oil was still rising. Nothing more was heard from the UB-115 and the entire crew were presumed to have perished along with their vessel. It is worth noting that UB-115 was the last U-boat to leave Zeebrugge to attack shipping. (U-boats Destroyed, R. M. Grant)

ref. used: 
 Robert M. Grant, U-Boats Destroyed
Lettens Jan16/02/2004UB-115, cmdr. Thomsen, F Flotilla was depth charged and sunk in the North Sea, 29 September 1918.
ref. used: 
 Fate of U-boats in WWI
Racey Carl03/10/2009Some consequences of the sinking of the UB-110 of the Yorkshire coast were described by Hector Bywater in a newspaper article:- A chart recovered from the wreck led to the destruction of five other submarines within two or three months’ time.
Later in a book he wrote on Naval Intelligence he states:- UB-110 was investigated by divers fairly soon after July 19th, and that her mines were laid over a period of several days, and it was eight days after the last laying that the U-boat was sunk. A chart recoved contained routes favoured by Fürbringer and other commanders. An interesting feature was a description noted on the chart of ‘safe resting places on the bed of the sea’.
If this statement is correct it may be significant that UC-70, UB-103 and UB-115 were found when they were lying on the bottom. It may be significant that a good deal of mine-laying was undertaken early in August.
On the 8th August mines were laid off Zeebrugge and a new minefield was begun off the Yorkshire coast. So it may well be the case that some some information concerning the Zeebrugge approaches and the U-boat operations off the East coast was acquired. UB-57 and UB-109 were sunk while passing through minefields along routes which their commanders regarded as safe. It is a fact that U-boat losses off the East coast began to increase.
ref. used: 
 Robert M. Grant, U-Boat Intelligence
Lettens Jan01/10/2009UK hydro member
ref. used: 
 UK Hydrographic Office

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About Owners
Imperial German Navy - Kaiserliche Marine (1903-1919)

Kaiserliche Marine or the German Imperial Navy is the name for the German Navy between 1903 and 1919. Most of the ships had a prefix SMS, Seine Majestäts Schiff, which is the equivalent of HMS, Her/His Majesty's Ship.

This Navy should not be confused with Reichsmarine (1920-1935) or Kriegsmarine (1935-1945).
About Builders
 Blohm & Voss, Hamburg
The name Blohm & Voss has stood for quality in ship construction and marine and mechanical engineering for 125 years. Blohm & Voss was founded in 1877 by Hermann Blohm and Ernst Voss as a general partnership. A shipyard was built on the island of Kuhwerder having three building berths along a 250m water front. - - -

Although the company was almost completely demolished at the end of World War II, it still builds warships both for the Deutsche Marine and for export. Today Blohm + Voss is an innovative German shipyard specializing in the construction of naval vessels and technically sophisticated megayachts from building facilities in Hamburg including repairs, refits, and modification of such vessels as well as merchant ships.

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