Diving Projects

Southsea Sub-Aqua Club has a long history of wreck site investigation. In recent years the Club has developed an association with a number of local wreck sites.

This project centres on the loss of a particular vessel during the Normandy operations. a British Landing Craft (Headquarters) sank on 25 June 1944 after a striking a mine.  Royal Navy veteran Patrick Thomas was aboard the Landing Craft when the mine exploded.  Many of his shipmates lost their lives when the ship sank.  Patrick’s dearest wish is to pay his respects to his comrades and our aim is to help him find their last resting place – the wreck of his Landing Craft.  Our project will play a part in helping Patrick honour his friends and tell the story of the tragic events of that day.  Providing research and archaeological expertise Patrick’s close friend John Henry-Philips who promised Patrick that he will find the ship for him.  Patrick’s experiences and the loss of the Landing Craft and John’s endeavours to find Patrick’s ship are to be filmed as part of a short documentary by Go-Button Media.

 Members of Southsea Sub-Aqua Club will also be working with subject matter expert and hydrographer Chris Howlett.  With Chris’s help we have identified a wreck site which may be that of Patrick's Landing Craft.  We aim to document the wreck and confirm whether it is Patrick’s ship so that he may know where his shipmates came to rest.  Professional archaeologist John Henry-Phillips will oversee the archaeological survey and report writing. 

USS Revenge
USS Revenge (courtesy US Archives)

The project centres on a British minesweeper HMS Cato (J16), sunk off the Normandy beaches on D-Day.  HMS Cato and her sister ships HMS Magic (J400) and Pylades (J401) were Catherine Class minesweepers  conducting mine clearance duties to protect the fleet on the Eastern beaches of JUNO and SWORD.  HMS Cato sank on 6 July 1944 whilst searching for survivors of her sister ship HMS Magic.  Just two days later another sister ship HMS Pylades also sank.  There is conflicting information about the cause of all three ship losses, namely whether by mine or torpedo possibly from the German Neger or Biber human torpedo weapons.  Whilst the wrecks of HMS Magic and Pylades are known, the primary aim of this project conducted by a team of divers from Southsea Sub-Aqua Club, is to locate and survey the wreck of HMS Cato. A wreck, identified as being HMS Cato does exist in the area. However, the dimensions and appearance of this wreck cast some doubt as to its true identity. Two charted wrecks exist relatively close by that could be HMS Cato and if time and conditions allow these will also be investigated.

Project Cardonnet

Since 1954 members of Southsea Sub-Aqua Club (SSAC) have enjoyed exploring our underwater world and the history that lays hidden by the depths. Over time our members have contributed much to the recreational diving world and the wider community through their determination, skills and hard work. From the invention of Octopush (underwater hockey) to the discovery of the historic Tudor flagship ‘Mary Rose’1 SSAC Branch2 have been one of the most active and productive branches of the British Sub-Aqua Club. For the last ten years the club have been actively recording many of the wrecks in its home waters along the south coast of England and in particular the many wrecks associated with the largest ever maritime invasion – the WW2 wrecks of 1944 Operation NEPTUNE3. It is a natural progression to extend this work to learn more about the Normandy campaign through the investigation and recording of unidentified wrecks of the Baie de Seine believed to be lost during this historic endeavour.

Project Cardonnet aims to investigate and record the WW2 Operation NEPTUNE wrecks of the Banc du Cardonnet, located in the Baie de Seine, Normandy. This ambitious project investigated two wrecks of US Landing Craft Tanks which were lost as they approached UTAH Beach as part of Operation NEPTUNE. US Landing Craft Tank (LCT(5) 458 and LCT(6) 593) both sank when they struck German mines and resulted in a tragic loss of life.

Shortly before dawn on 6 June 1944 eight US Navy LCTs carrying the 70th Tank Battalion’s DD tanks approached UTAH beach. As LCT(6) 593, with four of Company A’s DD Sherman tanks aboard, passed over the shallow Banc du Cardonnet it detonated an enormous German mine and was instantly broken in two. The power from the massive explosion propelled her men, vehicles and equipment into the air. Many lives were lost.

Just over 4 hours later LCT(5) 458 sank after hitting another mine while running into the beach. She was carrying 4 x M-7 Priests and supporting vehicles of Battery B, 29th Field Artillery. Many men lost their lives as the landing craft and her cargo of armoured fighting vehicles sank below the waves.

We were aware that in order to record and document the wrecks we would require permission from the Département des Recherches Archéologiques Subaquatiques et Sous-Marines (DRASSM). This was a daunting task as communications and application forms were necessarily to be conducted in French. Thankfully the Google translate site proved to be fairly reliable but we also contacted a former club member (Alain Demairé) who kindly provided a much needed conduit for conversations and his support to our project was highly valued.

Cécile Sauvage at DRASSM advised that in order to conduct the project all divers were required to obtain certification by the Institut National Plongee Professionnelle (INPP) equivalence at Level 1B. This required medical endorsement from a Hyperbaric Doctor and CMAS 3* or HSE commercial diver equivalence. Of the 8 divers who applied for INPP certification 7 were awarded INPP Level 1B. The other recreational divers who were part of the group were not permitted to dive on the same site at the same time that the project divers.

We are most grateful for the support of the British Sub-aqua Jubilee Fund and The BSAC Expedition Grant Scheme for their generous support ot the Expedition.

This project aims to investigate and record the wrecks of WW2 Tugs HMRT Sesame and USS Partridge lost on 11 June 1944 during Operation NEPTUNE. These were the only tugs lost during the Normandy campaign.

Normandy 70

Normandy 70 is an expedition by Southsea Sub-Aqua Club to dive and record wrecks of associated with the maritime phase of WW2 Allied invasion of Normandy otherwise known as Operation NEPTUNE.  This expedition was inspired by a BSAC Southern Region initiative (NEPTUNE 70) which seeks to encourage branches to investigate and dive wrecks associated with Operation Neptune in British waters. 

Following an approach from a group of English speaking divers, “Scuba Ninjas”, from France we are now embarking on a joint expedition to dive the WW2 Normandy wrecks with this group.  Scuba Ninjas are a multi-national and multi-cultural group of divers and we are delighted to have the opportunity to dive as a joint expedition.  They host a Facebook and web site to provide information and advice to English speaking divers – “Dive into France’. This multinational and multicultural expedition will provide the opportunity for divers from a number of different nationalities and cultures to commemorate the events of D Day and the subsequent liberation of France.

This joint expedition has developed fairly quickly but plans are fairly well advanced.  We have engaged widely with others including UKHO, with a view to exploring and recording a number of unidentified sites which may shed light on the what remains on the sea bed.  We intend to share our findings with appropriate public bodies thereby adding to the public record of this historic event.

We are most grateful to the BSAC Expeditions Grant Scheme which has made a grant of £1000 which may be used by the BSAC members to offset some expenses of the expedition, such as travel costs.

D Day

Mulberry 70

In recent years divers from Southsea Sub-Aqua Club (SSAC) have completed three projects to investigate, dive and record wrecks along the South Coast of England which played a part in the WW2 invasion of Normandy.

This year we are planning another ambitious project to survey 20+ sites that are believed to be connected to the Mulberry Harbours that played such a vital part in the supply of troops and equipment the Allied forces.  The building of the Top Secret Mulberry Harbours, each the size of Dover was the largest ever British construction project and completed in less than a year.  The various components of the Mulberry Harbours gathered along the south coast of England before being towed to France and carefully assembled to create two fully functional harbours within days of D Day was critical to supporting the invasion forces and ultimately the ending of WW2. 

Along the Hampshire and West Sussex coast alone there are in the region of 30 sites associated with the Mulberry project; from foreshore (construction/slipways), exposed/intertidal concrete units, to fully submerged bridges, pontoons and associated concrete caissons.  Southsea Sub-Aqua Club plan to provide an accurate and detailed record of these sites thereby adding to public record of the Mulberry Harbours in British waters.  In our discussions with English Heritage they have confirmed that data held on Mulberry Harbours is very limited and has potential to be inaccurate.

We are very grateful that our project has been financially supported by the BSAC Jubilee Trust with a grant of £1250 which will help defray the fuel costs for the Club RHIB, Southsea Explorer on Project Diving and sonar survey trips

His Majesty’s landing craft tank (LCT) 427 sank at 03:03 on 7th June 1944 at Spitbank Gate as she approached her home port. LCT 427 was returning to Portsmouth after delivering a cargo of Sherman duplex drive (DD) tanks to Gold Beach on D-Day as a part of the British lead assault under Operation Neptune. As she approached Portsmouth in the early hours of 7th June 1944, part of a flotilla of tank landing craft, she was in collision with the battleship HMS Rodney. The LCT was sliced in two amidships as she collided with the bow of HMS Rodney. All thirteen crew of LCT 427 were lost in the tragedy. The incident was not officially recorded for some months during which time the LCT and her crew were reported as missing.

The exact location of LCT 427 was not known when we began our investigation.

A team of divers from Southsea Sub-Aqua Club will solve the mystery of how two tanks, two bulldozers and a field gun, believed to be linked to D-Day and Project Neptune, came to rest on the sea bed eight miles offshore in Bracklesham Bay, West Sussex.

The historic WW2 armoured vehicles and gun lie jumbled up on the sea bed at a depth of 20m but there is no known associated shipwreck nearby. The divers will survey the site to establish how the equipment came to rest on the sea bed.

The project, led by Alison Mayor, has the approval of the MoD and a grant from the British Sub-Aqua Jubilee Trust.

The team behind this project wonthe Duke of Edinburgh's Prize in 2009

A1 was the first British-designed and built submarine. Although the Solent area wreck site of A1 has been known to a lot of divers and the marks published in many a book, the site has been off limits since its designation as a protected wreck in 1998. The combination of a new wreck to visit and the sheer importance of visiting such a historic wreck generated a lot of interest from within the club. In 2006 when we had enough qualified members to carry out survey work - some are NAS trained while others hold the Marine Conservation Society's "Seasearch" survey qualifications - we were able to survey the wreck. The survey was divided into two main areas: the hull structure and the marine life found on the hull.

SSAC Diving Officer Martin Davies is the licensee.


A number of divers have recorded and published videos on YouTube of their visit to HMS A1 over the years. We have created a playlist on our YouTube channel showing some of them. The videos have been arranged in order of when they were recorded or published (when the recording date is not clear), with the oldest first.

Click to view playlist