It was during the preparation of an article dealing with the Y-Peiler coded FuSan 424/Atlantik I Y UKW near Pludalmézeau ( Tomezzoli, 2024, in press ), that Mr. Henoff informed me about the existence, during the WWII, of another Y-Peiler coded Atlantik II near Penmarc’h (Finistère) and the discovery of its rests by three passionate researchers.

According to the witness of Mr. Auguste Dupouy ( KBC Penmarch, 2023 ), the Germans arrived by trucks on 20^th June 1940. They ended their invasion of the Finistère (Pen ar Bed) in Saint Guénolé en Penmarc’h. They arrived at the same time as the doryphores beetles, potato pest, and they acquired this nickname. From 20^th June, the Abschnittskommandant Fritz Jahn ordered to set the clocks to the German summer time, namely to advance the clocks by one hour and the same day, just before the signing of the Armistice, a list of prohibitions was posted almost everywhere. This list, which was almost identical throughout the entire French occupied territory, governed the rights and duties of the inhabitants in front of the Wehrmacht and the French Republic of Vichy. It will force residents to respect rules which will profoundly change their way of life. On 22^nd June, the Armistice between Germany and France was signed.

The industrial and energetic sites of the Finistère came under the immediate protection of the Werhmacht. The Wehrmacht placed here and there, on strategic sites in the countryside and along the coast, a few posts equipped with light weapons and deployed, almost everywhere, garrisons and soldiers’ cantonments.

The defence post Qu 301 at Saint Pierre in Penmarc’h hosted the Feldkommandantur at the Hôtel du Phare d’Eckmuhl, built by Charles Miroux, Amieux Factory manager. On 3^rd August 1940, seven soldiers were assigned to the Vieux Phare and the Eckmühl Lighthouse. They dug trenches in the courtyard of the Lighthouse and moved into the guards’ official accommodations. They were part of the Luftwaffe Feld Divisionen for the Flak (FLieger Abwehr Kanonen) and of the Kriegsmarine for the radio installation and coastal surveillance from the Pointe de Penmarc’h, then also from the radar installed in 1944. A machine gun nest was positioned on the coast, East of the Penmarc’h port.

In 1941, a Forbidden Zone following the coastline from the North to the South-West was imposed on the inhabitants. This area was affected by additional prohibitions and constraints.

It was from 23^rd March, 1942, following the Richtlinie 40 Kustenverteidigung that began the Atlantikwall construction.

In March 1942, military exercises brought Flak and Pak together on the Steir beach. In August 1942, Generalmajor Von Zangen inspected the coastal defences of Penmarc’h. In this occasion, personnel and equipment were reviewed on the Steir beach.

Qu 40 at la Torche peninsula North of Saint Guénolé, at the extreme South of the Audierne Bay, hosted a main commandment bunker storing a 75 mm gun turned to the Bay, a hangar storing two mobile PAK guns which could be deployed near the Bay or at Pors Carn, a tobrouk at the entrance towards the Bay and six other tobrouks armed with guns, one of them orientated towards Pors Carn. The soldiers were quartered in a shack located in close proximity to the commandment bunker. Three barbed lines and two mine fields, separated by the access road, protected Qu 40.

Qu 41 at Saint Guénolé, in July 1940, hosted a Heer cavalry company which was engaged in embarkment and landing exercises in preparation for the Great Britain invasion. A rescue boat was requisitioned, of which the soldiers did not took much care. A 47 mm anti-tank gun managed by Kriegmarine gunners protected the southern part of Saint Guénolé, la Joie and the Lighthouse. The northern part did not need protection, the coast being too dangerous for a landing. Only an intermittent observation post existed at Viben, held by the GAST (German Customs) and opening onto the coast. The nickname GAST in Breton had also the meaning of whore. Saint Guénolé was also a tourist hotspot for the occupier.

Qu 44 in Poulguen quartered the students of the Luftwaffe Flakartilleriechule and the Heer Pakartillerieschule. A 50 mm KwK anti-tank gun was located on the edge of Steir beach on the Guilvinec side.

Other defence posts were at La Joie Qu 42, Kérity Qu 43, Langourougan Qu 45.

On 21^st April 1944 and early May 1944, on the Poulguen dune in Penmarch, near said artillery gun, 1500 m from the Chateau of Steir-Poulguen, took place the execution of prisoners of the Saint Charles prison in Quimper. On 31^st August 1944, their mass grave returned 35 bodies.

USAF reconnaissance aircrafts were spying on the installations of the Qu 42 at La Joie and Qu 301. On 6^th June 1944, the Allied forces landed in Normandy. At the beginning of August 1944, German soldiers searched and requisitioned every bicycle in preparation for their departure. The Lighthouse and its engine room were mined, which made residents fear the worst and on 4^th August 1944 the Germans left Penmarc’h for the Pocket of Lorient.

Only the Kommandantur of QU 301 in Saint Pierre and the Hôtel du Phare d’Eckmühl got blown up ( KBC Penmarch, 2023 ).

Table 1 lists the German radars and Y-Peilers ( Trenkle, 1979 ) near Penmarc’h.

According to KBC Penmarch (2023) , the Penmarc’h FuMO comprised a FuMO 3 Calais Zerstörer (Zerstörerdrehsäule) (368 MHz, 8 KW, 7 - 12 Km) located at the top of the Vieux Phare and a FuSAn comprising a Y-Peiler, the FuMG of La Madeleine comprised a FuSE 80 Freya A/N Egon and a FuSAn comprising a Y-Peiler.

The map Morlaix Airfield area Airfields and Ln facilities ( Figure 1 ) of 14^th August 1943 ( Henoff, 2023 ) confirms the presence of this last Y-Peiler and indicates it as Atlantik II Y = UKW near Penmarc’h. On the map, Atlantik II is encircled in orange and indicated with a question mark.

Atlantik II should not be confused with the Funksendezentralen Atlantik in Guichen ( Tomezzoli et al., 2014 ).

The Rhubarb Operations (1944) ( Figure 2 ) describes FuSan 756 Atlantik II as follows: “1.ii) Pin point 47˚49'24"N. 4˚19'30"W. Grid ref: 017357. 3.i) On rising ground 1 mile N.E of the small town of PENMARCH, at the base of the promontory which terminate in the POINTE de PENMARCH. Approximately midway between the ANSE de la TORCHE on the N.W. and the port of GUILVINEC. 3.ii) Altitude, about 80 feet (~23.3 m) above the sea level. 4.i) The target consists of a single open wooden lattice tower, 60 feet (~18 m) high and tapering towards a 16 foot (~5 m) square platform at the top. Vulnerable points are the square cabin below and the cylindrical D/F room above the platform. 4.ii) About 600 yards (~548.6 m) to the N.N.W. of this tower and connected to it by underground cable is a semi-sunken building measuring 108’ × 43’ (~2.7 × 1 m). 100 yds (~91 m) to the W.S.W of this building is the usual small transmitter hut with its 80 ft. (~24 m) high mast. 4.iii.) Hedge around the tower but otherwise there are no defences within its immediate vicinity. At the large building a few slit tranches have been dug with a few weapon pits. 4.iv) Layout and immediate surroundings are shown on A.C.I.U. Plan No. G.160. Neg No. 38914R” ( Figure 2 ).

In the text 108’ × 43’ appears wrong, probably 108 × 43 ft (33 × 13 m) was intended.

Messrs Bruno Schavsinski, Yves Blanchard and Jacques Morvan visited the Atlantik II site on 08^th September 2012. The Atlantik II identified components were the following ( Figure 3 ).

The Pylon emplacement A comprising:

- 01) a concrete base (47˚49.383'N, 004˚19.431'W) buried in the terrain, only the upper surface was visible. Its dimensions were difficult to estimate. The upper surface let visible a slanted, rusted threaded screw on one side and the pebbles of the Ero Vili ( Tomezzoli & Marzin, 2015 ).

- 02) a ~ 60 × 60 cm concrete base (47˚49.382'N, 004˚19.426'W) severely degraded, emerging from the terrain. Only one side preserved part of the external concrete covering. The exposed portions let visible the pebbles of the Ero Vili. On the upper surface were two slanted, rusted threaded screws.

- 03) a ~ 65 × 65 cm concrete base (47˚49.388'N, 004˚19.432'W) severely degraded, emerging from the terrain. The exposed portions let visible the pebbles of the Ero Vili. In the centre of the upper surface was a 10 cm circular hole, on a corner, a bent, rusted, about 30 cm long, threaded screw and a 10 x 10 cm square hole on the other corner.

- 04) a ~ 60 × 60 cm concrete base (47˚49.386'N, 004˚19.433'W) in a good preservation state, slightly emerging from the terrain. In the centre of the upper surface was a 10 cm circular hole and one rusted threaded screw on each one of two opposed corners. The exposed portions let visible the pebbles of the Ero Vili.

The concrete bases were disposed at the corners of a square having 6.90 m long sides and 9.80 m long diagonal. Originally, the top square surface of each concrete base comprised: a 10 cm square hole on a corner for a threaded screw, a 20 cm square hole on the opposite corner for a threaded screw and a circular 10 cm hole in the middle.

On the terrain, among the concrete bases, the possible imprint of the square Range Measuring Cabin was visible.

To the North, neither the semi-sunken building B nor the rests of shacks were found at the location where actually a horse-riding club is located. Rests of the transmitter hut and the transmission mast were not found.

The Pylon A was burnt down by the German soldiers in retreat in summer 1944. The concrete bases 01) - 04) were destroyed in 2013 when the fields were sown.

Atlantik II had the same structure of Atlantik I: A) a wooden lattice tower (Heinrich), C) a semi-sunken building, and D) a nearby hut and mast (Hans). The wooden lattice tower was positioned at La Madeleine which is located in the larger district of Lescors. Therefore, Lescors and La Madeleine are two names used to indicate the same position. Consequently, one of the two identifications FuSAn 756 or FuSAn 757 ( Lippmann, 2021 ) is probably in excess.

Jones (2009) tells the Y-system historical development, its fighter driving method and the countermeasure Domino by which the British arrived to impair its functioning.

Felkin (1944a) describes devices used in the Y-Peyler transmitter unit, the D/F equipment and the range-measuring unit.

Felkin (1944b) , after having resumed the Y-fighter interception control methods, observes that: “35. A ‘Y’ control station requires nine men per shift, or 27/30 men per 24 hours, for its operation […]. The personnel of the ‘Y’ control station is distributed as follows: Transmitter hut: One operator. D/F Cabin: D/F Operator and log-book keeper. Range-Measuring Cabin: A Supervisor, range-measurer and log-book keeper. Plotting Room: Plotter (friendly plots), plotter (enemy-plots) and plotting officer”.

The necessity to host the plotting room and the 27/30 men lodgements explains the relatively large dimensions (33 × 13 m) of the semi-sunken building C.

Atlantik II, as well as Atlantik I and Lgw: Anl near Dora is indicated with a yellow circle ( Figure 2 ) and the Unterstellungsverhältnis (Subordination relationship) shows on 14^th August 1943 no subordinate relationship. The orange circle and the question mark around Atlantik II, as well as around Atlantik I and Lgw: Anl near Dora, probably indicated that, at said date, these stations were not yet operational or in construction. Because it had to drive day and night fighters, Atlantik II, as well as Atlantik I, were intended to be dependent from Luftwaffe.

The position of Atlantik II on the South of the Finistère ( Figure 1 ) was probably intended for driving German day and night fighters over the Biscay Bay.

The information provided by KBC Penmarch (2023) and Lippmann (2021) permits to proceed to a reconstruction ( Figure 4 ) of the possible vision of the Pointe de Penmarc’h during the WWII.

The visits on the field permitted to determine that, unfortunately, all the components of Atlantik II disappeared. However, as usual in historical researches, further issues remain to be solved: the possible operative state of Atlantik II reached after 20^th September 43, its possible subordinate relationship after that date, the possible missions accomplished. It is hoped that this article could form the basis for further studies on Atlantik II and the historical situation of Penmarc’h during the WWII.

I express my gratitude to Mr. Jacques Morvan for his information and images concerning the discovery of the rests of Atlantik II and to Mr. Frederic Henoff for having attracted my attention on Atlantik II.