• Short Summary

    JAPANESE ENGINEERS ARE GRADUALLY OVERCOMING A FORMIDABLE LIST OF OBSTACLES TO DRIVE THE WORLD'S LONGEST UNDER-SEA TUNNEL, SCHEDULED FOR COMPLETION IN 1975.

  • Description

    JAPANESE ENGINEERS ARE GRADUALLY OVERCOMING A FORMIDABLE LIST OF OBSTACLES TO DRIVE THE WORLD'S LONGEST UNDER-SEA TUNNEL, SCHEDULED FOR COMPLETION IN 1975. THE TUNNEL BENEATH THE TSUGARU STRAITS WILL LINK JAPAN'S MAIN ISLAND, HONSHU, WITH THE ISLAND OF HOKKAIDO -- A DISTANCE OF 22 MILES (35 KMS), OF WHICH 13 MILES (21 KMS) WILL BE UNDER THE SEA.

    THE COMPLETED TUNNEL WILL UNDOUBTEDLY BE A VALUABLE ASSET TO JAPAN. TRANSPORTATION FIGURES ON THE FERRIES BETWEEN HONSHU AND HOKKAIDO ARE RISING EVERY YEAR. IN 1965 THEY STOOD AT 3,940,000 PASSENGERS AND 6,160,000 TONS OF FREIGHT. BY 1975 THEY ARE EXPECTED TO BE 5,200,000 AND 8,500,000 RESPECTIVELY. AT PRESENT, THE FERRY JOURNEY BETWEEN AOMORI THE PORT TOWN ON THE EXTREME NORTHERN TIP OF HONSHU, AND KAKODATE, THE SOUTHERN PORT OF HOKKAIDO, TAKES NEARLY FOUR HOURS -- A TIME THAT WILL BE SEVERELY SLASHED WHEN TRAINS ARE MAKING THE JOURNEY BY TUNNEL.

    TEAMS OF WORKERS USING MODERN DRILLING MACHINERY HAVE NOW PENETRATED ABOUT HALF A MILES FROM CAPE SHIRAKAMIMISAKI, ON HOKKAIDO, AND A QUARTER OF A MILE IN FROM CAPE TAPPIZAKI, ON HONSHU. SOME 600 WORKERS AND ENGINEERS WORKED DAY AND NIGHT ON THREE SHIFTS. PROBLEMS FACING THEM ARE THE 10 FAULTS IN THE SEA BED, THREE OF THEM SERIOUS, AND WATER WHICH IS POURING INTO THE NEWLY-BORED TUNNEL AT THE RATE OF 1.5 TONS A MINUTE. TO STEM THE LEAKS, THE TUNNEL WALL IS BEING LINED WITH CONCRETE, AND TO AVOID THE DANGEROUS USE OF DYNAMITE FOR BLASTING THE TUNNELLERS ARE USING A SPECIAL SWISS BORING MACHINE DRIVEN BY ELECTRICITY.

    SPEED OF TUNNELLING HAS REACHED JUST UNDER TWO YARDS (ABOUT 1.5 METRES) AN HOUR. HOWEVER, ONE DIFFICULT STRETCH OF ONLY 26 FEET (8 METRES) TOOK NEARLY 100 DAYS TO EXCAVATE. IN ITS PRESENT FORM, THE TUNNEL WILL BE USED ONLY BY ELECTRIC TRAINS BECAUSE OF THE DIFFICULTY AND EXPENSE OF REMOVING EXHAUST FUMES IF A ROADWAY FOR CARS IS ALSO PROVIDED. AT PRESENT, THE INTENTION IS TO LAY ONLY A SINGLE LINE OF TRACK. THE TUNNEL, LYING 330 FEET (100 METRES) DEEP, WILL BE 22 FEET (6 1/2 METRES) IN DIAMETRES, WHILE A DOUBLE-LINE TRACK WOULD REQUIRE AN EXTRA 10 FEET (3 METRES) IN DIAMETRE.

  • Tags

  • Data

    Film ID:
    VLVAC3PA4ZZRZH4US7L2IC8J7OD2J
    Media URN:
    VLVAC3PA4ZZRZH4US7L2IC8J7OD2J
    Group:
    Reuters - Incuding Visnews
    Archive:
    Reuters
    Issue Date:
    16/05/1968
    Sound:
    Unknown
    HD Format:
    Available on request
    Stock:
    Colour
    Duration:
    00:02:41:00
    Time in/Out:
    /
    Canister:
    N/A

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