Hmsm A7 Wreck

Field Value
Wreck Category dangerous wreck
Status historic
Hmsm a7 Wreck Location
Marine Coordinates (DMM) 		50 18.525 N,4 18.007 W
Latitude, Longitude
Decimal Degrees
  • Latitude: 50.308750
  • Longitude: -4.300117
Wreck Depth 30.14 m
Water Depth 36 m
Water Level Effect always under water/submerged
Vertical Datum Approximate Lowest Astronomical Tide
Name HMSM A7
Type submarine
Flag GB
Length 30.2 m
Width 4 m
Sonar Length 23.3
Sonar Width 4.1
Shadow Height 5.9
Orientation 110
Tonnage 207
Tonnage Type displacement
Conspic Visual not visually conspicuous
Conspic Radar not radar conspicuous
Date Sunk Jan 16, 1914
Bottom Texture Mud
Original Detection Year 1914
Last Detection Year 2020
Original Source other
Surveying Details H4267/70 8.9.72 A7 IN 501810N, 041800W [OGB] USING DECCA. A FASTENER. ORIGINALLY REPORTED TO BE LYING ANGLED UPWARD 30-40DEGS WITH STERN BURIED IN MUD UP TO 22FT WITH BOW 33FT OFF BOTTOM. ATTEMPTS TO PULL HER OUT IN 1914 WITH BATTLESHIP [?TUG] 'EXMOUTH' FAILED. WK PROBABLY SETTLED BY NOW. (MR CALKIN, 1.9.72). CHART AS WK 26FMS. BR STD. H4979/72 2.1.73 WK IN 501830N, 041758W [OGB] USING HSA. LEAST DEPTH 34.0MTRS IN 37.0MTRS. NO SCOUR. OUTSIDE SURVEY AREA BUT LOCATED FROM INFORMATION SUPPLIED BY MR CALKIN. GOOD SONAR CONTACT FROM S BUT DIFFICULT TO FIND WITH E/S. SEEMS VERY SMALL FROM E/S TRACE. (HMS WOODLARK, 1972). CHART AS WK 34MTRS. NC 1267. H4979/72 3.7.80 WK LOCATED 5.6.80 IN 501822N, 041751E [OGB] USING DECCA. LEAST E/S DEPTH 33 IN 36MTRS. DCS3 HT 3MTRS. (HMS FAWN, EXERCISE BROWN HERON,). NCA. H1961/79 18.3.81 EXAM'D 31.3.80 IN 501829.2N, 041755.4W [OGB] USING TRISPONDER [2 LOP]. LEAST E/S DEPTH 33.4 IN GEN DEPTH 37MTRS. DCS3 HT 2.72MTRS. SCOUR 1MTR DEEP. LIES 080/260DEGS ON GREY CLAY. POOR E/S RETURN. (HMS WOODLARK, HI 71A/80). CHART AS WK 33 MTRS. BR STD. 16.9.85 DIVED ON BY PLYMOUTH CDT. CONFIRMED AS WK OF A7. STILL IN VERY GOOD CONDITION. LIES UPRIGHT, BURIED IN MUD UP TO WHAT WOULD NORMALLY HAVE BEEN ITS WATERLINE. (LT NUTT, TELECON). NCA. 10.11.89 DIVED ON BY EXETER BSAC IN 501821N, 041752W [OGB]. CONNING TOWER AND PERISCOPE INTACT. (E THOMAS, TELECON). NCA. HH100/351/07 15.7.93 DIVED 19.4.92 IN 501833N, 041800W [OGB] USING DECCA. LEAST DEPTH OBTAINED 39MTRS [DIVER AT LW NEAPS]. LARGELY BURIED IN MUD, DECK CASING STANDS ONLY 1MTR CLEAR OF SEABED. CONNING TOWER AND PERISCOPE STAND 2-3MTRS CLEAR. (G PEACHAM, 30.6.93). NCA. HH100/351/13 26.2.98 WK IS INTACT AND LYING ON AN EVEN KEEL. IN THE MUD UP TO HER SURFACE MARKS. PERISCOPE EXTENDED. TORPEDO LOADING HATCH AND CONNING TOWER HATCH STILL CLOSED. SMALL HOLE ON HER STBD SIDE WHERE A TORCH CAN BE SHONE IN. LIES E/W. STANDS 3MTRS HIGH BY DIVE COMPUTER. (P F BALL, 23.2.98). NCA. HH232/450/06 27.9.02 DESIGNATED AS PROTECTED MILITARY WRECK WITH RESTRICTED AREA RADIUS 200MTRS CENTRED ON 5018.518N, 0417.984W [WGD]. (STATUTORY INSTRUMENT 1761/02). - NM 5208/02 & NM 5291/03. HH232/450/08 7.4.06 EXAM'D 4.4.06 IN 5018.5271N, 0418.0082W [WGD]. SWEPT CLEAR 31.3, FOUL 31.8MTRS. LEAST M/B DEPTH 30.93MTRS. (HMS ECHO, SIGNAL DTD 4.4.06). AMEND SW 31MTRS IN REVISED POSN. - NM 2194/06. HH232/450/08 27.4.06 LEAST M/B DEPTH 30.58 IN GEN DEPTH 35.5MTRS. INTACT WITH LITTLE DEBRIS AND NO SCOUR. LIES 135/315 DEGS. (HMS ECHO, ROS). NCA. SEP 2006/000394419 30.10.06 STATUTORY INSTRUMENT 1761/02 CANCELLED. REDESIGNATED AS PROTECTED MILITARY WRECK WITH RESTRICTED AREA RADIUS 200MTRS CENTRED ON 5018.518N, 0417.984W [WGD]. (STATUTORY INSTRUMENT 2616/06). NCA. 28.4.08 PREVIOUS SI CANCELLED. REDESIGNATED AS PROTECTED MILITARY WRECK WITH RESTRICTED AREA RADIUS 200MTRS CENTRED ON 5018.518N, 0417.984W [WGD]. (STATUTORY INSTRUMENT 950/08). 1.2.10 PREVIOUS SI CANCELLED. REDESIGNATED AS PROTECTED MILITARY WRECK WITH RESTRICTED AREA RADIUS 200MTRS CENTRED ON 5018.518N, 0417.984W [WGD]. (STATUTORY INSTRUMENT 3380/09). 16.6.17 PREVIOUS SI CANCELLED. REDESIGNATED AS PROTECTED MILITARY WRECK WITH RESTRICTED AREA RADIUS 200MTRS CENTRED ON 5018.518N, 0417.984W [WGD]. (STATUTORY INSTRUMENT 147/2017). SEP 2020/000287353 25.11.20 WRECK EXAMINED 26.4.20 IN POSITION 5018.525N, 0418.007W [WGD], LEAST M/B DEPTH 30.14 MTRS IN GENERAL DEPTH 36 MTRS, LENGTH 23 MTRS, WIDTH 4 MTRS, HEIGHT 5.9 MTRS, ORIENTATION 110 DEGS. (HI1678, CLINTON MARINE SURVEY LTD). AMEND DW 30 MTRS IN REVISED POSN.
Last Amended Date Nov 25, 2020

Circumstances of loss

FAILED TO SURFACE DURING AN EXERCISE OFF RAME HEAD.

General Comments

INTACT AND LYING ON AN EVEN KEEL

WRECK MAP LOADING ... 50 18.525 N,4 18.007 W
Hmsm A7 on Wreck Map Hmsm A7 Wreck on Google Map

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FAQ

Where is the HMSM A7 wreck located?

The HMSM A7 wreck is located at coordinates 50 18.525 N,4 18.007 W.

How deep is the HMSM A7 and where exactly is it located?

The HMSM A7 lies at a depth of about 30.14 meters and is located at coordinates 50 18.525 N,4 18.007 W.

How deep is the seabed around the HMSM A7?

The seabed around the HMSM A7 lies at approximately 36 meters deep.

When did the HMSM A7 sink?

The HMSM A7 sank on Jan 16, 1914.

When was the wreck of the HMSM A7 discovered?

The wreck of the HMSM A7 was discovered in 1914.

What country did the HMSM A7 belong to?

The HMSM A7 belonged to GB.

What was the tonnage of the HMSM A7?

The HMSM A7 had a tonnage of 207 tons.

What type of wreck is the HMSM A7?

The HMSM A7 is classified as a submarine.

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