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Instructor 1*, Instructor 2*, Instructor 3*

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The Koh Tao wrecks


    Tottori Maru


    The Gulf of Siam was invaded by patrol SubSoWesPac to the end of the Second World War. The interior of the Gulf has long been marked off limits for submarine patrols because the military thought dotted with mines. But in March 1945 patrols in the Gulf were taken over by the British submarine TRADEWIND. In April, the HARDHEAD covered the approaches of Bangkok in May 1945, the submarine Baya, LAGARTO and HAMMERHEAD entered the Gulf and found targets. Working as a team with the Baya for attacks on convoys, the LAGARTO was lost and Baya was damaged by cons more important measures than expected. However the HAMMERHEAD sank a small freighter off the Malaysian coast on May 6, and in the same area trickled TOTTORI MARU, a passenger cargo 5,973 tons May 15 After that, the traffic between Siam and Singapore has been "reduced to almost nothing." (excerpt from the book "UNITED STATES SUBMARINE OPERATIONS IN WORLD WAR II" by Theodore Roscoe 1949). The wreck lies on its starboard side in 58 meters of water. The highest part of the wreck is 40 meters with a length of 150m and a tonnage of 5-7000 tons. The ship is damaged starboard side environment. More extensive research is required but is suspected to share the coordinates identified by the submarine Hammerhead it could well be the Tottori Maru, a "hell ship" used to transport prisoners of war allies


    japanese merchant ships at war tottori maru


    Tottori Maru Class -- The Hellship Tottori Maru and its sister ship, Tokushima Maru were built in Glasgow, Scotland in 1913 - 1914. These 6,057 Gross Ton ships were 423 feet long, 56 feet in breadth and capable of speeds of 10 knots.

    Photograph above and information courtesy of



    japanese merchant ships at war tottori maru


    picture above courtesy of the Japanese Commercial Navy Maritime Museum, Koba Japan


    totturi maru rice kettle
    tottori maru deck fishtottori maru fish hiding in the wreck


    The above 3 color images - Picture credit to Chris Clark,



    TYPE_OF_VESSEL: frieghter, 'hellship'






    LOCATION: southern part gulf of siam










    WRECK_TONS: 5700




    BOTTOM_CONDITION: covered in soft coral



    HOW_WRECK_SUNK: torpedoed by US Submarine,USS Hammehead 1944. 1 torpedo mid ships and one in bow which tore it halfway off WRECK_DOING_WHAT: transporting war supplies. This vessel was also a well known 'Hell Ship' used for carrying allied POW's, though non was on board when she was sank


    .japanese merchant ships at war tottori maru



Wreck Speciality course



  • Must be at least Adventure Diver or Advanced Open Water Diver
  • and have minimum 15 years

Price 380.- € The full course

The price included

  • Dives
  • Book
  • Certification
  • Monitor
  • Insurance
  • Lunch
  • Non-alcoholic beverages

The price not included

  • * Tips
  • * Extras expenses


You can subscribe by e-mail or by phone.

E-mail thank you for giving me:

- Your name and surname

- Your phone or GSM

Must be present at each class and participate in simulations.

If no, thank you prevent.

We sarrangera to catch up the lost session.

A written and practical exam is required to obtain a degree.

Candidates not having the examination will not be certified.

During the sessions, you can take notes, ask questions and interrupt the course if you do not understand.

Do not be afraid, you're there to learn at your own pace and most importantly stress free.

You will receive a manual to study at home safely and review techniques.

For your reservation

50% deposit to confirm your reservation

The remaining starting your course

Any deposit is lost 30 days before the course date.



Special wreck certification speciality







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