Plm 21 Wreck

Field Value
Wreck Category dangerous wreck
Plm 21 Wreck Location
Marine Coordinates (DMM) 		51 42.051 N,5 6.469 W
Latitude, Longitude
Decimal Degrees
  • Latitude: 51.700850
  • Longitude: -5.107817
Wreck Depth 9.293 m
Water Depth 11 m
Water Level Effect always under water/submerged
Vertical Datum Approximate Lowest Astronomical Tide
Name PLM 21
Type steam ship
Flag FR
Length 121.9 m
Width 17.1 m
Draught 8.6
Sonar Length 130
Sonar Width 41
Shadow Height 2.5
Orientation 118
Tonnage 5417
Tonnage Type gross
Cargo coal
Conspic Visual not visually conspicuous
Conspic Radar not radar conspicuous
Date Sunk Dec 3, 1944
Bottom Texture 6,4,17
Original Detection Year 1944
Last Detection Year 2023
Original Source other
Surveying Details H4981/44 22.12.44 H4981/44 22.12.44 WK IN 514200N, 050625W APPROX WITH MAST, FUNNEL, BRIDGE AND SUPERSTRUCTURE VISIBLE AT HW. 400FT LONG, HEADING 101DEGS. GPFL(2)G.10S LT ESTABLISHED ON WK. (ADMIRALTY). - TNM 2883/44. H4981/44 13.1.45 H4981/44 13.1.45 STF, BOWS 154DEGS, 8C FROM GREAT CASTLE HD HIGH LT, STERN 281DEGS, 400FT FROM BOWS. MARKED BY G CAN LT BUOY, GPFL(2)G, CLOSE SE. (ADMIRALTY). - NM 120/45. H4981/44 11.4.46 H4981/44 11.4.46 NOW DWP. (ADMIRALTY). - NM 1249/46. H4981/44 15.10.47 H4981/44 15.10.47 DERRICK POSTS VISIBLE ON BOW & STERN. (HMS SEAGULL). - NM 2678/47. H01008/40 24.10.51 H01008/40 24.10.51 TWO MASTS VISIBLE AT HW. FIXED IN 514202N, 050622W. (HMS SCOTT, 17.10.51). H5030/52 21.8.52 H5030/52 21.8.52 BEING DISPERSED TO BE COMPLETED 30.12.54. (TH). H5030/52 27.5.53 H5030/52 27.5.53 SALVAGE OPS IN PROGRESS. (MARINE CONTRACTORS). - TNM 1194/53. H5901/54 28.10.54 H5901/54 28.10.54 SHOWN AS DWP (BEING REMOVED) ON HMS SCOTT SURVEY [E9720]. NC 2879. H5901/54 23.12.55 H5901/54 23.12.55 LEAST DEPTHS OVER DWP ARE 33, 31 AND 33FT. (MARINE CONTRACTORS AND TH). - NM 2935/55. H5030/52 10.2.56 H5030/52 10.2.56 LT BUOY REMOVED. (QHM PEMBROKE DOCK & TH). - NM 27/56. H5293/71 28.11.72 H5293/71 28.11.72 POSN 514202N, 050624W [OGB]. LYING 110/290DEG, ABOUT 220FT LONG, LEAST DEPTH 9.2 MTRS. (CONTRACT SURVEY [K6484/11] 1972). 30.11.93 30.11.93 NOT SHOWN ON MILFORD HAVEN P.A. SURVEY [M2000/6]. (LONGDIN & BROWNING SURVEYS LTD MAY 1992). NCA YET. HH100/351/14 1.12.98 HH100/351/14 1.12.98 CONSIDERED TO BE 'FRENCHMAN'. LIES IN 514204.5N, 050628W [OGB]. (D LEWIS, NOTES DTD 4.98). NCA. 12.10.05 12.10.05 EUT POSN: 5142.059N, 0506.465W. NE 3273. SEP 2022/000131013 17.09.22 EXAM'D BY BDC IN 5142.052N, 0506.0736W [WGD]. LEAST M/B DEPTH 9.497MTRS. LENGTH 131.9MTRS, WIDTH 46.1MTRS, HEIGHT 2.2MTRS (MHPA SURVEY DTD 2021) RETAIN DEPTH IN REVISED POSN RSDRA2025000292248 11.09.2025 � � EXAM'D 16.07.2023; �LOCATED IN 5142.051N, 0506.469W [WGD]. LEAST M/B DEPTH 9.29MTRS IN GEN DEPTH 11MTRS. LENGTH 130MTRS, WIDTH 41MTRS, HEIGHT 2.5MTRS, ORIENTATION 118/298DEGS. MARGINALLY CHANGED POSITION COMPARED TO THE CHARTED AREA AND POSITION. THE WRECK DOES NOT LOOK TO BE IN ONE PIECE BY DOES STAND PROUD OF THE SEABED. (HMS MAGPIE, HI1807-H525-12024). DEPTH UNCHANGED, POSN UPDATED.
Last Amended Date Sep 16, 2025

Circumstances of loss

BUILT IN 1921 BY SIR RAYLTON DIXON & CO. OWNED AT TIME OF LOSS BY BY SOC NATIONELE D'AFFRETEMENTS. THREE BOILERS, QUADRUPLE EXPANSION ENGINE OF 529NHP. SINGLE SHAFT. PASSAGE FOR MILFORD HAVEN. SUNK AFTER GROUNDING ON MIDDLE CHANNEL ROCKS, MILFORD HAVEN. (SIBI).

WRECK MAP LOADING ... 51 42.051 N,5 6.469 W
Plm 21 on Wreck Map Plm 21 Wreck on Google Map

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FAQ

Where is the PLM 21 wreck located?

The PLM 21 wreck is located at coordinates 51 42.051 N,5 6.469 W.

How deep is the PLM 21 and where exactly is it located?

The PLM 21 lies at a depth of about 9.293 meters and is located at coordinates 51 42.051 N,5 6.469 W.

How deep is the seabed around the PLM 21?

The seabed around the PLM 21 lies at approximately 11 meters deep.

When did the PLM 21 sink?

The PLM 21 sank on Dec 3, 1944.

When was the wreck of the PLM 21 discovered?

The wreck of the PLM 21 was discovered in 1944.

What country did the PLM 21 belong to?

The PLM 21 belonged to FR.

What cargo was the PLM 21 carrying?

The PLM 21 was carrying coal.

What was the tonnage of the PLM 21?

The PLM 21 had a tonnage of 5417 tons.

What type of wreck is the PLM 21?

The PLM 21 is classified as a steam ship.

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