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Hms/m Graph: Campa, Islay, Atlantic

Submarine (20th Century)

Site Name Hms/m Graph: Campa, Islay, Atlantic

Classification Submarine (20th Century)

Alternative Name(s) U-570; N46; P715; P175; Hms Graph; Coul Point; Coull Point; North Channel; Hmsm Graph (P.715)(Ex U.570); Hms Graph (Ex. U-570)

Canmore ID 102623

Site Number NR16NE 8002

NGR NR 19713 65773

Datum WGS84 - Lat/Long

Permalink http://canmore.org.uk/site/102623

Ordnance Survey licence number 100057073. All rights reserved.
© Copyright and database right 2016.

Administrative Areas

  • Council Argyll And Bute
  • Parish Maritime - Argyll And Bute
  • Former Region Strathclyde
  • Former District Maritime
  • Former County Not Applicable

Archaeology Notes

NR16NE 8002 1955 6555

N55 48.1 W6 28.5

NLO: Campa [name: NR 200 658]

Coul Point [name: NR 188 644].

Formerly entered as Site no. 1.

(Location map and photographs).

S Blackburn 1986.

Horizontal Datum = OGB

General water depth = 5

Circumstances of Loss Details

-----------------------------

HMS GRAPH was captured on 28 August 1941 by HMS BURWELL and HM Trawler NORTHERN CHIEF in north Atlantic, after being depth-charged by the RAF aircraft of 269 squadron on the previous day. It was wrecked when the tow broke adrift while en-route from Chatham to the Clyde. It was scrapped in situ 1947.

Surveying Details

-----------------------------

10 October 1953. A certificate of purchase was issued to the Fixed Mortgage Trust Ltd.

9 February 1970. J R Scott esq of Ardbeg, Port Ellen, Islay now owns this wreck. He reports that the conning tower aft is still in one piece, but forward of this there is very little left.

Letter from J R Scott 6 February 1970

2 July 1981. The wreck is reported to lie at 55 48 06N, 006 28 30W in approximately 5 metres. It is well broken up, but easily located as large winch, which has been abandoned, overlooks the site.

Letter from D W Argood, 24 June 1981.

19 July 1982. The pennant number is believed to be N46 not P715.

Hydrographic Office, 1995.

The disadvantages of operating this exotic vessel are described on the basis of her single operational patrol (off northern Norway). The torpedo tubes were modified to fire British torpedoes and the valves were adapted to hydraulic working, rather than the manual working of German practice; many of the instruments retained their German labels and were calibrated in metric units.

German U-boats were designed to operate further from their bases than their British counterparts, being longer-ranged, deeper-diving, faster and more robust, with a consequent reduction in surface stability and crew comfort. Living conditions were primitive in the extreme and surface stability notably lacking, making surface watchkeeping uncomfortable. Crew efficiency deteriorated noticeably after about three weeks.

The surface speed of a U-boat was about 19kts, some 4kts faster than the British equivalent. Surface buoyancy was also reduced. The German high capacity batteries and MAN aluminium alloy engines had a comparatively short life, the batteries requiring annual replacement as against the British practice of having them last the life of the boat. Their diesel engines were, however, reversible. The electrical system was particularly complicated, while air bottles and fuel tanks were mounted outside the pressure hull. It was German practice to fit twin rudders for extra manoeuvrability and to use steel for periscopes and propellers, both being lighter and stronger than those in British service. U-boats never had a tight stern gland so their deep bilges needed constant pumping. Most U-boat machinery was mounted on buna (ersatz rubber). These differences provided enough spare weight to allow the use of steel 7/8in (22mm) thick for the hull, as against the 5/8in (16mm) of British practice.

Although the battery plates were replaced, the lack of compatible spares brought the operational use of this boat to an end. She was used for training and experimental duties in the Clyde before an unsuccessful attempt at a refit (in July 1943) resulted in her being taken out of service.

The capture of the vessel is also described, the name HMS/M Graph being taken from the code-name of the operation to recover the vessel from Canada to Britain.

P Durham 1996.

(Classified as submarine: former name cited as U-570, and date of loss as 20 March 1944). HMS [HMS/M] Graph: this vessel came ashore on the W side of Islay after breaking from tow.

Registration: London. Built 1941. 769 tons displacement. Length: 64m. Beam: 6m.

(Location of loss cited as N55 48.22 W6 28.48).

I G Whittaker 1998.

Plans and photographs of this vessel are held in the National Maritime Museum, Greenwich.

(For online catalogue of negatives, see www.nmm.ac.uk/historicphotographs).

Information from Ms G Fabri (NMM), 7 November 2003.

Activities

Evidence Of Loss (1986)

(Location map and photographs).

S Blackburn 1986.

Evidence Of Loss (1995)

Horizontal Datum = OGB

General water depth = 5

Circumstances of Loss Details

-----------------------------

HMS GRAPH was captured on 28 August 1941 by HMS BURWELL and HM Trawler NORTHERN CHIEF in north Atlantic, after being depth-charged by the RAF aircraft of 269 squadron on the previous day. It was wrecked when the tow broke adrift while en-route from Chatham to the Clyde. It was scrapped in situ 1947.

Surveying Details

-----------------------------

10 October 1953. A certificate of purchase was issued to the Fixed Mortgage Trust Ltd.

9 February 1970. J R Scott esq of Ardbeg, Port Ellen, Islay now owns this wreck. He reports that the conning tower aft is still in one piece, but forward of this there is very little left.

Letter from J R Scott 6 February 1970

2 July 1981. The wreck is reported to lie at 55 48 06N, 006 28 30W in approximately 5 metres. It is well broken up, but easily located as large winch, which has been abandoned, overlooks the site.

Letter from D W Argood, 24 June 1981.

19 July 1982. The pennant number is believed to be N46 not P715.

Hydrographic Office, 1995.

External Reference (1996)

The disadvantages of operating this exotic vessel are described on the basis of her single operational patrol (off northern Norway). The torpedo tubes were modified to fire British torpedoes and the valves were adapted to hydraulic working, rather than the manual working of German practice; many of the instruments retained their German labels and were calibrated in metric units.

German U-boats were designed to operate further from their bases than their British counterparts, being longer-ranged, deeper-diving, faster and more robust, with a consequent reduction in surface stability and crew comfort. Living conditions were primitive in the extreme and surface stability notably lacking, making surface watchkeeping uncomfortable. Crew efficiency deteriorated noticeably after about three weeks.

The surface speed of a U-boat was about 19kts, some 4kts faster than the British equivalent. Surface buoyancy was also reduced. The German high capacity batteries and MAN aluminium alloy engines had a comparatively short life, the batteries requiring annual replacement as against the British practice of having them last the life of the boat. Their diesel engines were, however, reversible. The electrical system was particularly complicated, while air bottles and fuel tanks were mounted outside the pressure hull. It was German practice to fit twin rudders for extra manoeuvrability and to use steel for periscopes and propellers, both being lighter and stronger than those in British service. U-boats never had a tight stern gland so their deep bilges needed constant pumping. Most U-boat machinery was mounted on buna (ersatz rubber). These differences provided enough spare weight to allow the use of steel 7/8in (22mm) thick for the hull, as against the 5/8in (16mm) of British practice.

Although the battery plates were replaced, the lack of compatible spares brought the operational use of this boat to an end. She was used for training and experimental duties in the Clyde before an unsuccessful attempt at a refit (in July 1943) resulted in her being taken out of service.

The capture of the vessel is also described, the name HMS/M Graph being taken from the code-name of the operation to recover the vessel from Canada to Britain.

P Durham 1996.

Loss (20 March 1944)

(Classified as submarine: former name cited as U-570, and date of loss as 20 March 1944). HMS [HMS/M] Graph: this vessel came ashore on the W side of Islay after breaking from tow.

Registration: London. Built 1941. 769 tons displacement. Length: 64m. Beam: 6m.

(Location of loss cited as N55 48.22 W6 28.48).

I G Whittaker 1998.

External Reference (7 November 2003)

Plans and photographs of this vessel are held in the National Maritime Museum, Greenwich.

(For online catalogue of negatives, see www.nmm.ac.uk/historicphotographs).

Information from Ms G Fabri (NMM), 7 November 2003.

Reference (19 April 2012)

UKHO Identifier : 003731

Feature Class : Wreck

Wreck Category : Dangerous wreck

State : LIVE

Classification : Unclassified

Position (Lat/long) : 55.80375,-6.47361

Horizontal Datum : ORDNANCE SURVEY OF GREAT BRITAIN (1936)

WGS84 Position (Lat/long) : 55.80366,-6.47456

WGS84 Origin : 3-D Cartesian Shift (BW)

Previous Position : 55.80167,-6.47500

Position Quality : Unreliable

Depth Quality : Depth unknown

Water Depth : 5

Vertical Datum : Lowest Astronomical Tide

Name : HMSM GRAPH (P.715)(EX U.570)

Type : SUBMARINE

Flag : BRITISH

Length : 64.9

Beam : 6.1

Draught : 4.9

Tonnage : 880

Tonnage Type : Displacement

Date Sunk : 20/03/1944

Contact Description : Entire wreck

Original Sensor : Reported Sinking

Last Sensor : None reported

Original Detection Year : 1944

Last Detection Year : 1996

Original Source : Other

Last Source : Other

Circumstances of Loss : **EX-U-570. CAPTURED 28.8.41 BY HMS BURWELL & HMT NORTHERN CHIEF IN N ATLANTIC AFTER BEING DEPTH CHARGED BY RAF AIRCRAFT OF 269 SQDN ON THE PREVIOUS DAY. REFITTED IN BARROW, EMERGING AS HMSM GRAPH. AFTER COLLISION WITH DOCKYARD WALL IN CHATHAM WAS TOWED TO CLYDE FOR USE AS DEPTH CHARGE TARGET. STRIPPED OF ALL INTERNAL FITTINGS AND TOWED BY TUG 'EMPIRE JOHN'. BROKE TOW AT 0410 ON 18.3.44 IN 50MPH WINDS. DRIFTED ASHORE. SCRAPPED IN SITU.

Surveying Details : **H3436/53 10.10.53 CERTIFICATE OF PURCHASE TO FIXED MORTGAGE TRUST LTD. (D.N.C)

**H1248/70 9.2.70 NOW OWNED BY J R SCOTT OF ARDBEG, PORT ELLEN, ISLAY. CONNING TOWER AFT IS STILL IN ONE PIECE, BUT FORWARD OF THIS VERY LITTLE LEFT. (J R SCOTT, LTR DTD 6.2.70).

**H1310/81/12 2.7.81 REPORTED TO LIE IN 554806N, 062830W IN APPROX DEPTH 5MTRS. WELL BROKEN UP. EASILY LOCATED AS LARGE WINCH, WHICH HAS BEEN ABANDONED, OVERLOOKS SITE. (D W ARGOOD, 24.6.81). NCA.

**H1283/82/149 19.7.82 PENNANT NUMBER BELIEVED TO BE N46 NOT P715. (R CRABTREE).

**9.12.96 POSN GIVEN AS 554813N, 062829W [WGD]. (ARGYLL SHIPWRECKS).

Charting Comments : POSN FOR FILING ONLY

Date Last Amended : 27/09/2002

Date Position Last Amended : 09/12/1996

Reference (2011)

Whittaker ID : 301

Name : HMS GRAPH (EX. U-570)

Latitude : 554813

Longitude : 62829

Date Built : 1941

Registration : LONDON

Type : SUBMARINE

Tonnage : 769

Tonnage Code : D

Length : 64

Beam : 6

Draught : 5m

Position : Exact Position

Loss Day : 20

Loss Month : 3

Loss Year : 1944

Comment : Broke from tow and came ashore on the west side of Islay

References

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